ICD-10-CM 2027 diagnosis code
R10.816Epigastric abdominal tenderness
R10.816 is a valid, billable ICD-10-CM code for epigastric abdominal tenderness. It can be reported on claims for dates of service from October 1, 2026 – September 30, 2027.
Code unchanged since ICD-10-CM took effect on October 1, 2015. Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data
About R10.816
R10.816 is the ICD-10-CM diagnosis code for epigastric abdominal tenderness. It belongs to category R10 (abdominal and pelvic pain), block R10-R19 (symptoms and signs involving the digestive system and abdomen) and chapter 18 (symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified). It is billable, so it can be reported on its own for dates of service from October 1, 2026 through September 30, 2027.
Within R10.81 (abdominal tenderness), R10.816 is specifically for epigastric abdominal tenderness. Related codes cover right upper quadrant abdominal tenderness (R10.811), left upper quadrant abdominal tenderness (R10.812), right lower quadrant abdominal tenderness (R10.813), left lower quadrant abdominal tenderness (R10.814), periumbilic abdominal tenderness (R10.815), generalized abdominal tenderness (R10.817) and unspecified site (R10.819).
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 391 (Esophagitis, Gastroenteritis and Miscellaneous Digestive Disorders with MCC, relative weight 1.2392) and DRG 392 (Esophagitis, Gastroenteritis and Miscellaneous Digestive Disorders without MCC, relative weight 0.7645), in MDC 06 (Diseases and Disorders of the Digestive 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.
It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.
Before ICD-10, this condition was coded in ICD-9-CM as 789.66 (abdominal tenderness, epigastric).
Notes that apply from higher levels
Instructions written at a parent level also apply to R10.816.
› From R10.81 Abdominal tenderness
Broader instructions also apply from R10-R19 Symptoms and signs involving the digestive system and abdomen and Chapter 18: Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified.
Alphabetic index entries
1 entriesTerms in the official ICD-10-CM index that lead to R10.816.
MS-DRG v44.0 grouping
All DRGs →Inpatient MS-DRGs this diagnosis can group to, as the principal or a secondary diagnosis, depending on the rest of the claim.
MDC 06 · Diseases and Disorders of the Digestive System
ICD-9-CM equivalent
Converter →- 789.66Abdominal tenderness, epigastricapproximate
From the CMS 2018 General Equivalence Mappings (GEMs), the final GEMs release.
Code history
- 2016
- 2017
- 2018
- 2019
- 2020
- 2021
- 2022
- 2023
- 2024
- 2025
- 2026
- 2027
- FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
- No changes since FY2016.
Common questions about R10.816
Is R10.816 billable?
- Yes. R10.816 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can R10.816 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict R10.816 as a principal diagnosis.
Is R10.816 a CC or MCC?
- No. R10.816 is neither a CC nor an MCC under MS-DRG v44.0.
What DRG does R10.816 group to?
- R10.816 is used in the MS-DRG v44.0 logic for MS-DRG 391 (Esophagitis, Gastroenteritis and Miscellaneous Digestive Disorders with MCC) and MS-DRG 392 (Esophagitis, Gastroenteritis and Miscellaneous Digestive Disorders without MCC). Which one applies depends on whether it is the principal diagnosis and on the rest of the claim.
What is the ICD-9 code for R10.816?
- The CMS General Equivalence Mappings map R10.816 to ICD-9-CM 789.66.