2026 ICD-10-CM Diagnosis Code S36.508SUnspecified injury of other part of colon, sequela

ICD-10-CM Codes›S00–T88›S30-S39›S36

ICD-10-CM S36.508S
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

S36.508S is a billable ICD-10-CM diagnosis code for unspecified injury of other part of colon, sequela. The 7th character S marks it as a sequela code, which reports a problem that remains after the original condition has resolved. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 393 through 395. The code is exempt from POA reporting. Coders also document this condition as injury of appendix. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Injury, sequela.

Code Identity

ICD-10-CM Code
S36.508S
Billable Status
Yes — Valid for Submission
Code Describes
Unspecified injury of other part of colon, sequela
Short Description
Unspecified injury of other part of colon, sequela
Same as the full description in the CMS dataset.
Parent Code
S36.508
Unspecified injury of other part of colon

Code Classification

ChapterS00–T88Injury, poisoning and certain other consequences of external causes
SectionS30-S39Injuries to the abdomen, lower back, lumbar spine, pelvis and external genitals
CategoryS36Injury of intra-abdominal organs
This CodeS36.508SUnspecified injury of other part of colon, sequela

Present on Admission (POA)Billing

S36.508S is exempt from POA reporting on inpatient claims to general acute care hospitals. Review other POA exempt codes.

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Injury of appendix
  • Injury of appendix with open wound into abdominal cavity
  • Injury of appendix without open wound into abdominal cavity
  • Injury of cecum
  • Injury of intestine without open wound into abdominal cavity
  • Injury of multiple intra-abdominal organs with open wound into abdominal cavity
  • Injury to colon/rectum
  • Multiple injuries of digestive system
  • Multiple injuries of intestine
  • Multiple injuries to colon or rectum with open wound into cavity

Coding GuidelinesGuidance

The appropriate 7th character is to be added to each code from block Injury of intra-abdominal organs (S36). Use the following options for the applicable episode of care:

  • A - initial encounter
  • D - subsequent encounter
  • S - sequela

Source: ICD-10-CM Official Guidelines for Coding and Reporting, FY 2026, published by CMS and the National Center for Health Statistics.

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR INJ073
Injury, sequela
Default principal diagnosis: inpatient Yes · outpatient Yes

Patient EducationClinical

Colonic Diseases

Your colon, also known as the large intestine, is part of your digestive system. It's a long, hollow tube at the end of your digestive tract where your body makes and stores stool. Many disorders affect the colon's ability to work properly. Some of these include:

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Convert S36.508S to ICD-9-CMHistory

The closest ICD-9-CM equivalents under the General Equivalence Mappings.

ICD-9-CM
908.1 Late eff int inj abdomen
Approximate The match is approximate rather than exact.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About S36.508SOverview

Is S36.508S (Unspecified injury of other part of colon) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report unspecified injury of other part of colon, sequela on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What does the 7th character S in S36.508S mean?

The final character S makes this a sequela code: it reports a lingering problem that remains after the unspecified injury of other part of colon itself has resolved, not the original event.

What MS-DRG does S36.508S group to?

When unspecified injury of other part of colon, sequela is the principal diagnosis on an inpatient stay, it groups to MS-DRG 393, 394, 395, with relative weights from 0.6490 to 1.5993 depending on complications. Higher weights mean higher Medicare reimbursement.

Is S36.508S exempt from POA reporting?

Yes. CMS lists this code among those exempt from present on admission reporting, so hospitals do not assign a POA indicator for unspecified injury of other part of colon, sequela on inpatient claims.

What is the ICD-9 equivalent of S36.508S?

Under the General Equivalence Mappings, unspecified injury of other part of colon, sequela converts to ICD-9-CM 908.1 (late eff int inj abdomen). The mapping is approximate, so confirm the match fits the documentation.

Footnotes

[1] Not chronic - A diagnosis code that does not fit the criteria for chronic condition (duration, ongoing medical treatment, and limitations) is considered not chronic. Some codes designated as not chronic are acute conditions. Other diagnosis codes that indicate a possible chronic condition, but for which the duration of the illness is not specified in the code description (i.e., we do not know the condition has lasted 12 months or longer) also are considered not chronic.