MS-DRG v44.0 · MDC PRE: Pre-MDC
998 — Principal Diagnosis Invalid as Discharge Diagnosis
Source: CMS MS-DRG v44.0 and FY2027 IPPS final rule. Page updated September 29, 2026.
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About MS-DRG 998
MS-DRG 998, Principal Diagnosis Invalid as Discharge Diagnosis, is a DRG in Pre-MDC under MS-DRG version 44.0, which applies to inpatient discharges from October 1, 2026 through September 30, 2027.
279 ICD-10-CM diagnosis codes are part of this DRG's grouping logic; they are listed below.
ICD-10-CM codes that group to DRG 998 (279)
Chapter 15: Pregnancy, childbirth and the puerperium
- O09.00Supervision of pregnancy with history of infertility, unspecified trimester
- O09.01Supervision of pregnancy with history of infertility, first trimester
- O09.02Supervision of pregnancy with history of infertility, second trimester
- O09.03Supervision of pregnancy with history of infertility, third trimester
- O09.10Supervision of pregnancy with history of ectopic pregnancy, unspecified trimester
- O09.11Supervision of pregnancy with history of ectopic pregnancy, first trimester
- O09.12Supervision of pregnancy with history of ectopic pregnancy, second trimester
- O09.13Supervision of pregnancy with history of ectopic pregnancy, third trimester
- O09.211Supervision of pregnancy with history of pre-term labor, first trimester
- O09.212Supervision of pregnancy with history of pre-term labor, second trimester
- O09.213Supervision of pregnancy with history of pre-term labor, third trimester
- O09.219Supervision of pregnancy with history of pre-term labor, unspecified trimester
- O09.291Supervision of pregnancy with other poor reproductive or obstetric history, first trimester
- O09.292Supervision of pregnancy with other poor reproductive or obstetric history, second trimester
- O09.293Supervision of pregnancy with other poor reproductive or obstetric history, third trimester
- O09.299Supervision of pregnancy with other poor reproductive or obstetric history, unspecified trimester
- O09.30Supervision of pregnancy with insufficient antenatal care, unspecified trimester
- O09.31Supervision of pregnancy with insufficient antenatal care, first trimester
- O09.32Supervision of pregnancy with insufficient antenatal care, second trimester
- O09.33Supervision of pregnancy with insufficient antenatal care, third trimester
- O09.40Supervision of pregnancy with grand multiparity, unspecified trimester
- O09.41Supervision of pregnancy with grand multiparity, first trimester
- O09.42Supervision of pregnancy with grand multiparity, second trimester
- O09.43Supervision of pregnancy with grand multiparity, third trimester
- O09.511Supervision of elderly primigravida, first trimester
- O09.512Supervision of elderly primigravida, second trimester
- O09.513Supervision of elderly primigravida, third trimester
- O09.519Supervision of elderly primigravida, unspecified trimester
- O09.521Supervision of elderly multigravida, first trimester
- O09.522Supervision of elderly multigravida, second trimester
- O09.523Supervision of elderly multigravida, third trimester
- O09.529Supervision of elderly multigravida, unspecified trimester
- O09.611Supervision of young primigravida, first trimester
- O09.612Supervision of young primigravida, second trimester
- O09.613Supervision of young primigravida, third trimester
- O09.619Supervision of young primigravida, unspecified trimester
- O09.621Supervision of young multigravida, first trimester
- O09.622Supervision of young multigravida, second trimester
- O09.623Supervision of young multigravida, third trimester
- O09.629Supervision of young multigravida, unspecified trimester
- O09.70Supervision of high risk pregnancy due to social problems, unspecified trimester
- O09.71Supervision of high risk pregnancy due to social problems, first trimester
- O09.72Supervision of high risk pregnancy due to social problems, second trimester
- O09.73Supervision of high risk pregnancy due to social problems, third trimester
- O09.811Supervision of pregnancy resulting from assisted reproductive technology, first trimester
- O09.812Supervision of pregnancy resulting from assisted reproductive technology, second trimester
- O09.813Supervision of pregnancy resulting from assisted reproductive technology, third trimester
- O09.819Supervision of pregnancy resulting from assisted reproductive technology, unspecified trimester
- O09.821Supervision of pregnancy with history of in utero procedure during previous pregnancy, first trimester
- O09.822Supervision of pregnancy with history of in utero procedure during previous pregnancy, second trimester
- O09.823Supervision of pregnancy with history of in utero procedure during previous pregnancy, third trimester
- O09.829Supervision of pregnancy with history of in utero procedure during previous pregnancy, unspecified trimester
- O09.891Supervision of other high risk pregnancies, first trimester
- O09.892Supervision of other high risk pregnancies, second trimester
- O09.893Supervision of other high risk pregnancies, third trimester
- O09.899Supervision of other high risk pregnancies, unspecified trimester
- O09.90Supervision of high risk pregnancy, unspecified, unspecified trimester
- O09.91Supervision of high risk pregnancy, unspecified, first trimester
- O09.92Supervision of high risk pregnancy, unspecified, second trimester
- O09.93Supervision of high risk pregnancy, unspecified, third trimester
- O09.A0Supervision of pregnancy with history of molar pregnancy, unspecified trimester
- O09.A1Supervision of pregnancy with history of molar pregnancy, first trimester
- O09.A2Supervision of pregnancy with history of molar pregnancy, second trimester
- O09.A3Supervision of pregnancy with history of molar pregnancy, third trimester
- O10.02Pre-existing essential hypertension complicating childbirth
- O10.12Pre-existing hypertensive heart disease complicating childbirth
- O10.22Pre-existing hypertensive chronic kidney disease complicating childbirth
- O10.32Pre-existing hypertensive heart and chronic kidney disease complicating childbirth
- O10.42Pre-existing secondary hypertension complicating childbirth
- O10.92Unspecified pre-existing hypertension complicating childbirth
- O11.4Pre-existing hypertension with pre-eclampsia, complicating childbirth
- O12.04Gestational edema, complicating childbirth
- O12.14Gestational proteinuria, complicating childbirth
- O12.24Gestational edema with proteinuria, complicating childbirth
- O13.4Gestational [pregnancy-induced] hypertension without significant proteinuria, complicating childbirth
- O14.04Mild to moderate pre-eclampsia, complicating childbirth
- O14.14Severe pre-eclampsia complicating childbirth
- O14.24HELLP syndrome, complicating childbirth
- O14.94Unspecified pre-eclampsia, complicating childbirth
- O16.4Unspecified maternal hypertension, complicating childbirth
- O24.02Pre-existing type 1 diabetes mellitus, in childbirth
- O24.12Pre-existing type 2 diabetes mellitus, in childbirth
- O24.32Unspecified pre-existing diabetes mellitus in childbirth
- O24.420Gestational diabetes mellitus in childbirth, diet controlled
- O24.424Gestational diabetes mellitus in childbirth, insulin controlled
- O24.425Gestational diabetes mellitus in childbirth, controlled by oral hypoglycemic drugs
- O24.429Gestational diabetes mellitus in childbirth, unspecified control
- O24.82Other pre-existing diabetes mellitus in childbirth
- O24.92Unspecified diabetes mellitus in childbirth
- O25.2Malnutrition in childbirth
- O26.62Liver and biliary tract disorders in childbirth
- O26.72Subluxation of symphysis (pubis) in childbirth
- O60.10X0Preterm labor with preterm delivery, unspecified trimester, not applicable or unspecified
- O60.10X1Preterm labor with preterm delivery, unspecified trimester, fetus 1
- O60.10X2Preterm labor with preterm delivery, unspecified trimester, fetus 2
- O60.10X3Preterm labor with preterm delivery, unspecified trimester, fetus 3
- O60.10X4Preterm labor with preterm delivery, unspecified trimester, fetus 4
- O60.10X5Preterm labor with preterm delivery, unspecified trimester, fetus 5
- O60.10X9Preterm labor with preterm delivery, unspecified trimester, other fetus
- O60.12X0Preterm labor second trimester with preterm delivery second trimester, not applicable or unspecified
- O60.12X1Preterm labor second trimester with preterm delivery second trimester, fetus 1
- O60.12X2Preterm labor second trimester with preterm delivery second trimester, fetus 2
- O60.12X3Preterm labor second trimester with preterm delivery second trimester, fetus 3
- O60.12X4Preterm labor second trimester with preterm delivery second trimester, fetus 4
- O60.12X5Preterm labor second trimester with preterm delivery second trimester, fetus 5
- O60.12X9Preterm labor second trimester with preterm delivery second trimester, other fetus
- O60.13X0Preterm labor second trimester with preterm delivery third trimester, not applicable or unspecified
- O60.13X1Preterm labor second trimester with preterm delivery third trimester, fetus 1
- O60.13X2Preterm labor second trimester with preterm delivery third trimester, fetus 2
- O60.13X3Preterm labor second trimester with preterm delivery third trimester, fetus 3
- O60.13X4Preterm labor second trimester with preterm delivery third trimester, fetus 4
- O60.13X5Preterm labor second trimester with preterm delivery third trimester, fetus 5
- O60.13X9Preterm labor second trimester with preterm delivery third trimester, other fetus
- O60.14X0Preterm labor third trimester with preterm delivery third trimester, not applicable or unspecified
- O60.14X1Preterm labor third trimester with preterm delivery third trimester, fetus 1
- O60.14X2Preterm labor third trimester with preterm delivery third trimester, fetus 2
- O60.14X3Preterm labor third trimester with preterm delivery third trimester, fetus 3
- O60.14X4Preterm labor third trimester with preterm delivery third trimester, fetus 4
- O60.14X5Preterm labor third trimester with preterm delivery third trimester, fetus 5
- O60.14X9Preterm labor third trimester with preterm delivery third trimester, other fetus
- O60.20X0Term delivery with preterm labor, unspecified trimester, not applicable or unspecified
- O60.20X1Term delivery with preterm labor, unspecified trimester, fetus 1
- O60.20X2Term delivery with preterm labor, unspecified trimester, fetus 2
- O60.20X3Term delivery with preterm labor, unspecified trimester, fetus 3
- O60.20X4Term delivery with preterm labor, unspecified trimester, fetus 4
- O60.20X5Term delivery with preterm labor, unspecified trimester, fetus 5
- O60.20X9Term delivery with preterm labor, unspecified trimester, other fetus
- O60.22X0Term delivery with preterm labor, second trimester, not applicable or unspecified
- O60.22X1Term delivery with preterm labor, second trimester, fetus 1
- O60.22X2Term delivery with preterm labor, second trimester, fetus 2
- O60.22X3Term delivery with preterm labor, second trimester, fetus 3
- O60.22X4Term delivery with preterm labor, second trimester, fetus 4
- O60.22X5Term delivery with preterm labor, second trimester, fetus 5
- O60.22X9Term delivery with preterm labor, second trimester, other fetus
- O60.23X0Term delivery with preterm labor, third trimester, not applicable or unspecified
- O60.23X1Term delivery with preterm labor, third trimester, fetus 1
- O60.23X2Term delivery with preterm labor, third trimester, fetus 2
- O60.23X3Term delivery with preterm labor, third trimester, fetus 3
- O60.23X4Term delivery with preterm labor, third trimester, fetus 4
- O60.23X5Term delivery with preterm labor, third trimester, fetus 5
- O60.23X9Term delivery with preterm labor, third trimester, other fetus
- O63.2Delayed delivery of second twin, triplet, etc.
- O66.41Failed attempted vaginal birth after previous cesarean delivery
- O67.0Intrapartum hemorrhage with coagulation defect
- O67.8Other intrapartum hemorrhage
- O67.9Intrapartum hemorrhage, unspecified
- O68Labor and delivery complicated by abnormality of fetal acid-base balance
- O69.0XX0Labor and delivery complicated by prolapse of cord, not applicable or unspecified
- O69.0XX1Labor and delivery complicated by prolapse of cord, fetus 1
- O69.0XX2Labor and delivery complicated by prolapse of cord, fetus 2
- O69.0XX3Labor and delivery complicated by prolapse of cord, fetus 3
- O69.0XX4Labor and delivery complicated by prolapse of cord, fetus 4
- O69.0XX5Labor and delivery complicated by prolapse of cord, fetus 5
- O69.0XX9Labor and delivery complicated by prolapse of cord, other fetus
- O69.1XX0Labor and delivery complicated by cord around neck, with compression, not applicable or unspecified
- O69.1XX1Labor and delivery complicated by cord around neck, with compression, fetus 1
- O69.1XX2Labor and delivery complicated by cord around neck, with compression, fetus 2
- O69.1XX3Labor and delivery complicated by cord around neck, with compression, fetus 3
- O69.1XX4Labor and delivery complicated by cord around neck, with compression, fetus 4
- O69.1XX5Labor and delivery complicated by cord around neck, with compression, fetus 5
- O69.1XX9Labor and delivery complicated by cord around neck, with compression, other fetus
- O69.2XX0Labor and delivery complicated by other cord entanglement, with compression, not applicable or unspecified
- O69.2XX1Labor and delivery complicated by other cord entanglement, with compression, fetus 1
- O69.2XX2Labor and delivery complicated by other cord entanglement, with compression, fetus 2
- O69.2XX3Labor and delivery complicated by other cord entanglement, with compression, fetus 3
- O69.2XX4Labor and delivery complicated by other cord entanglement, with compression, fetus 4
- O69.2XX5Labor and delivery complicated by other cord entanglement, with compression, fetus 5
- O69.2XX9Labor and delivery complicated by other cord entanglement, with compression, other fetus
- O69.3XX0Labor and delivery complicated by short cord, not applicable or unspecified
- O69.3XX1Labor and delivery complicated by short cord, fetus 1
- O69.3XX2Labor and delivery complicated by short cord, fetus 2
- O69.3XX3Labor and delivery complicated by short cord, fetus 3
- O69.3XX4Labor and delivery complicated by short cord, fetus 4
- O69.3XX5Labor and delivery complicated by short cord, fetus 5
- O69.3XX9Labor and delivery complicated by short cord, other fetus
- O69.4XX0Labor and delivery complicated by vasa previa, not applicable or unspecified
- O69.4XX1Labor and delivery complicated by vasa previa, fetus 1
- O69.4XX2Labor and delivery complicated by vasa previa, fetus 2
- O69.4XX3Labor and delivery complicated by vasa previa, fetus 3
- O69.4XX4Labor and delivery complicated by vasa previa, fetus 4
- O69.4XX5Labor and delivery complicated by vasa previa, fetus 5
- O69.4XX9Labor and delivery complicated by vasa previa, other fetus
- O69.5XX0Labor and delivery complicated by vascular lesion of cord, not applicable or unspecified
- O69.5XX1Labor and delivery complicated by vascular lesion of cord, fetus 1
- O69.5XX2Labor and delivery complicated by vascular lesion of cord, fetus 2
- O69.5XX3Labor and delivery complicated by vascular lesion of cord, fetus 3
- O69.5XX4Labor and delivery complicated by vascular lesion of cord, fetus 4
- O69.5XX5Labor and delivery complicated by vascular lesion of cord, fetus 5
- O69.5XX9Labor and delivery complicated by vascular lesion of cord, other fetus
- O69.81X0Labor and delivery complicated by cord around neck, without compression, not applicable or unspecified
- O69.81X1Labor and delivery complicated by cord around neck, without compression, fetus 1
- O69.81X2Labor and delivery complicated by cord around neck, without compression, fetus 2
- O69.81X3Labor and delivery complicated by cord around neck, without compression, fetus 3
- O69.81X4Labor and delivery complicated by cord around neck, without compression, fetus 4
- O69.81X5Labor and delivery complicated by cord around neck, without compression, fetus 5
- O69.81X9Labor and delivery complicated by cord around neck, without compression, other fetus
- O69.82X0Labor and delivery complicated by other cord entanglement, without compression, not applicable or unspecified
- O69.82X1Labor and delivery complicated by other cord entanglement, without compression, fetus 1
- O69.82X2Labor and delivery complicated by other cord entanglement, without compression, fetus 2
- O69.82X3Labor and delivery complicated by other cord entanglement, without compression, fetus 3
- O69.82X4Labor and delivery complicated by other cord entanglement, without compression, fetus 4
- O69.82X5Labor and delivery complicated by other cord entanglement, without compression, fetus 5
- O69.82X9Labor and delivery complicated by other cord entanglement, without compression, other fetus
- O69.89X0Labor and delivery complicated by other cord complications, not applicable or unspecified
- O69.89X1Labor and delivery complicated by other cord complications, fetus 1
- O69.89X2Labor and delivery complicated by other cord complications, fetus 2
- O69.89X3Labor and delivery complicated by other cord complications, fetus 3
- O69.89X4Labor and delivery complicated by other cord complications, fetus 4
- O69.89X5Labor and delivery complicated by other cord complications, fetus 5
- O69.89X9Labor and delivery complicated by other cord complications, other fetus
- O69.9XX0Labor and delivery complicated by cord complication, unspecified, not applicable or unspecified
- O69.9XX1Labor and delivery complicated by cord complication, unspecified, fetus 1
- O69.9XX2Labor and delivery complicated by cord complication, unspecified, fetus 2
- O69.9XX3Labor and delivery complicated by cord complication, unspecified, fetus 3
- O69.9XX4Labor and delivery complicated by cord complication, unspecified, fetus 4
- O69.9XX5Labor and delivery complicated by cord complication, unspecified, fetus 5
- O69.9XX9Labor and delivery complicated by cord complication, unspecified, other fetus
- O74.0Aspiration pneumonitis due to anesthesia during labor and delivery
- O74.1Other pulmonary complications of anesthesia during labor and delivery
- O74.2Cardiac complications of anesthesia during labor and delivery
- O74.3Central nervous system complications of anesthesia during labor and delivery
- O74.4Toxic reaction to local anesthesia during labor and delivery
- O74.5Spinal and epidural anesthesia-induced headache during labor and delivery
- O74.6Other complications of spinal and epidural anesthesia during labor and delivery
- O74.7Failed or difficult intubation for anesthesia during labor and delivery
- O74.8Other complications of anesthesia during labor and delivery
- O74.9Complication of anesthesia during labor and delivery, unspecified
- O75.0Maternal distress during labor and delivery
- O75.1Shock during or following labor and delivery
- O75.5Delayed delivery after artificial rupture of membranes
- O75.81Maternal exhaustion complicating labor and delivery
- O75.82Onset (spontaneous) of labor after 37 completed weeks of gestation but before 39 completed weeks gestation, with delivery by (planned) cesarean section
- O75.89Other specified complications of labor and delivery
- O75.9Complication of labor and delivery, unspecified
- O76Abnormality in fetal heart rate and rhythm complicating labor and delivery
- O77.0Labor and delivery complicated by meconium in amniotic fluid
- O77.1Fetal stress in labor or delivery due to drug administration
- O77.8Labor and delivery complicated by other evidence of fetal stress
- O77.9Labor and delivery complicated by fetal stress, unspecified
- O80Encounter for full-term uncomplicated delivery
- O82Encounter for cesarean delivery without indication
- O88.02Air embolism in childbirth
- O88.12Amniotic fluid embolism in childbirth
- O88.22Thromboembolism in childbirth
- O88.32Pyemic and septic embolism in childbirth
- O88.82Other embolism in childbirth
- O98.02Tuberculosis complicating childbirth
- O98.12Syphilis complicating childbirth
- O98.22Gonorrhea complicating childbirth
- O98.32Other infections with a predominantly sexual mode of transmission complicating childbirth
- O98.42Viral hepatitis complicating childbirth
- O98.52Other viral diseases complicating childbirth
- O98.62Protozoal diseases complicating childbirth
- O98.72Human immunodeficiency virus [HIV] disease complicating childbirth
- O98.82Other maternal infectious and parasitic diseases complicating childbirth
- O98.92Unspecified maternal infectious and parasitic disease complicating childbirth
- O99.02Anemia complicating childbirth
- O99.12Other diseases of the blood and blood-forming organs and certain disorders involving the immune mechanism complicating childbirth
- O99.214Obesity complicating childbirth
- O99.284Endocrine, nutritional and metabolic diseases complicating childbirth
- O99.314Alcohol use complicating childbirth
- O99.324Drug use complicating childbirth
- O99.334Smoking (tobacco) complicating childbirth
- O99.344Other mental disorders complicating childbirth
- O99.354Diseases of the nervous system complicating childbirth
- O99.42Diseases of the circulatory system complicating childbirth
- O99.52Diseases of the respiratory system complicating childbirth
- O99.62Diseases of the digestive system complicating childbirth
- O99.72Diseases of the skin and subcutaneous tissue complicating childbirth
- O99.814Abnormal glucose complicating childbirth
- O99.824Streptococcus B carrier state complicating childbirth
- O99.834Other infection carrier state complicating childbirth
- O99.844Bariatric surgery status complicating childbirth
- O99.892Other specified diseases and conditions complicating childbirth
- O9A.12Malignant neoplasm complicating childbirth
- O9A.22Injury, poisoning and certain other consequences of external causes complicating childbirth
- O9A.32Physical abuse complicating childbirth
- O9A.42Sexual abuse complicating childbirth
- O9A.52Psychological abuse complicating childbirth
Common questions about DRG 998
What is the relative weight of DRG 998?
- CMS doesn't publish a relative weight for DRG 998.
Is DRG 998 medical or surgical?
- DRG 998 isn't classified as medical or surgical.