ICD-10-CM 2027
ICD-10 code for primary oligomenorrhea
From the official ICD-10-CM alphabetic index entry “Oligomenorrhea › primary”. Page updated September 29, 2026.
About coding primary oligomenorrhea
The ICD-10-CM code for primary oligomenorrhea is N91.3 (Primary oligomenorrhea).
Within N91 (absent, scanty and rare menstruation), N91.3 is specifically for primary oligomenorrhea. Related codes cover primary amenorrhea (N91.0), secondary amenorrhea (N91.1), amenorrhea, unspecified (N91.2), secondary oligomenorrhea (N91.4) and oligomenorrhea, unspecified (N91.5).
It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.
In MS-DRG v44.0, it is part of the grouping logic for DRG 742 (Uterine and Adnexa Procedures for Non-Malignancy with CC/MCC, relative weight 1.8456), DRG 743 (Uterine and Adnexa Procedures for Non-Malignancy without CC/MCC, relative weight 1.2974), DRG 760 (Menstrual and Other Female Reproductive System Disorders with CC/MCC, relative weight 1.0129) and DRG 761 (Menstrual and Other Female Reproductive System Disorders without CC/MCC, relative weight 0.7041), in MDC 13 (Diseases and Disorders of the Female Reproductive System), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.
Common questions about primary oligomenorrhea ICD-10 codes
What is the ICD-10 code for primary oligomenorrhea?
- N91.3 — Primary oligomenorrhea.
Is N91.3 billable?
- Yes. N91.3 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can N91.3 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict N91.3 as a principal diagnosis.
Is N91.3 a CC or MCC?
- No. N91.3 is neither a CC nor an MCC under MS-DRG v44.0.