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ICD-10-CM 2027 diagnosis code

R10.8A2Left flank tenderness

✓ Billable / specific

R10.8A2 is a valid, billable ICD-10-CM code for left flank tenderness. It can be reported on claims for dates of service from October 1, 2026 – September 30, 2027.

Code last changed in FY2026 (effective October 1, 2025). Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data

About R10.8A2

R10.8A2 is the ICD-10-CM diagnosis code for left flank 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 R10.8A (flank tenderness), R10.8A2 is specifically for left flank tenderness. Related codes cover right flank tenderness (R10.8A1), suprapubic tenderness (R10.8A3) and unspecified (R10.8A9).

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 was added in FY2026, effective October 1, 2025.

Notes that apply from higher levels

Instructions written at a parent level also apply to R10.8A2.

› From R10 Abdominal and pelvic pain
Excludes1
  • renal colic (N23)
Excludes2
  • costovertebral (angle) tenderness (R39.85)
  • dorsalgia (M54.-)
  • flatulence and related conditions (R14.-)

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 entries

Terms in the official ICD-10-CM index that lead to R10.8A2.

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.

Code history

  1. 2016
  2. 2017
  3. 2018
  4. 2019
  5. 2020
  6. 2021
  7. 2022
  8. 2023
  9. 2024
  10. 2025
  11. 2026
  12. 2027
  • FY2026 (effective 10/1/2025): Added
  • No changes since FY2026.

Common questions about R10.8A2

Is R10.8A2 billable?

Yes. R10.8A2 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).

Can R10.8A2 be used as a principal diagnosis?

Yes. The Medicare Code Editor doesn't restrict R10.8A2 as a principal diagnosis.

Is R10.8A2 a CC or MCC?

No. R10.8A2 is neither a CC nor an MCC under MS-DRG v44.0.

What DRG does R10.8A2 group to?

R10.8A2 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.