2026 ICD-10-CM Diagnosis Code S36.530ALaceration of ascending [right] colon, initial encounter
S36.530A is a billable ICD-10-CM diagnosis code for laceration of ascending [right] colon, initial encounter. The 7th character A marks it as an initial encounter code, used while the patient is receiving active treatment. 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, 963 through 965. Coders also document this condition as injury of ascending colon. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Internal organ injury, initial encounter.
Code Identity
Code Classification
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Injury of ascending colon
- Laceration of ascending colon
- Perforation of colon
- Traumatic perforation of ascending colon
- Traumatic perforation of large intestine
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.
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
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Convert S36.530A to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About S36.530AOverview
Is S36.530A (Laceration of ascending [right] colon) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report laceration of ascending [right] colon, initial encounter on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
What does the 7th character A in S36.530A mean?
The final character A marks the initial encounter: use it while the patient is receiving active treatment for laceration of ascending [right] colon, such as an emergency visit or first evaluation.
What MS-DRG does S36.530A group to?
When laceration of ascending [right] colon, initial encounter is the principal diagnosis on an inpatient stay, it groups to MS-DRG 393, 394, 395, 963, 964, 965, with relative weights from 0.6490 to 2.7338 depending on complications. Higher weights mean higher Medicare reimbursement.
What is the ICD-9 equivalent of S36.530A?
Under the General Equivalence Mappings, laceration of ascending [right] colon, initial encounter converts to ICD-9-CM 863.41 (ascending colon inj-clos). 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.
