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ICD-10-CM 2027 diagnosis code

R19.35Periumbilic abdominal rigidity

✓ Billable / specific

R19.35 is a valid, billable ICD-10-CM code for periumbilic abdominal rigidity. 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 R19.35

R19.35 is the ICD-10-CM diagnosis code for periumbilic abdominal rigidity. It belongs to category R19 (other symptoms and signs involving the digestive system and abdomen), 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 R19.3 (abdominal rigidity), R19.35 is specifically for periumbilic abdominal rigidity. Related codes cover unspecified site (R19.30), right upper quadrant abdominal rigidity (R19.31), left upper quadrant abdominal rigidity (R19.32), right lower quadrant abdominal rigidity (R19.33), left lower quadrant abdominal rigidity (R19.34), epigastric abdominal rigidity (R19.36) and generalized abdominal rigidity (R19.37).

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 393 (Other Digestive System Diagnoses with MCC, relative weight 1.5881), DRG 394 (Other Digestive System Diagnoses with CC, relative weight 0.9228) and DRG 395 (Other Digestive System Diagnoses without CC/MCC, relative weight 0.6382), 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 789.45 (abdominal rigidity, periumbilic).

Notes that apply from higher levels

Instructions written at a parent level also apply to R19.35.

› From R19.3 Abdominal rigidity
Excludes1
  • abdominal rigidity with severe abdominal pain (R10.0)
› From R19 Other symptoms and signs involving the digestive system and abdomen
Excludes1

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 R19.35.

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.

ICD-9-CM equivalent

Converter →
  • 789.45Abdominal rigidity, periumbilicexact

From the CMS 2018 General Equivalence Mappings (GEMs), the final GEMs release.

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
  • FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
  • No changes since FY2016.

Common questions about R19.35

Is R19.35 billable?

Yes. R19.35 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).

Can R19.35 be used as a principal diagnosis?

Yes. The Medicare Code Editor doesn't restrict R19.35 as a principal diagnosis.

Is R19.35 a CC or MCC?

No. R19.35 is neither a CC nor an MCC under MS-DRG v44.0.

What DRG does R19.35 group to?

R19.35 is used in the MS-DRG v44.0 logic for MS-DRG 393 (Other Digestive System Diagnoses with MCC), MS-DRG 394 (Other Digestive System Diagnoses with CC) and MS-DRG 395 (Other Digestive System Diagnoses without CC/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 R19.35?

The CMS General Equivalence Mappings map R19.35 to ICD-9-CM 789.45.