2026 ICD-10-CM Diagnosis Code S36.020AMinor contusion of spleen, initial encounter

ICD-10-CM Codes›S00–T88›S30-S39›S36

ICD-10-CM S36.020A
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

S36.020A is a billable ICD-10-CM diagnosis code for minor contusion of spleen, 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 814 through 816, 963 through 965. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Internal organ injury, initial encounter.

Code Identity

ICD-10-CM Code
S36.020A
Billable Status
Yes — Valid for Submission
Code Describes
Minor contusion of spleen, initial encounter
Short Description
Minor contusion of spleen, initial encounter
Same as the full description in the CMS dataset.
Parent Code
S36.020
Minor contusion of spleen

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 CodeS36.020AMinor contusion of spleen, initial encounter

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 INJ010
Internal organ injury, initial encounter
Default principal diagnosis: inpatient Yes · outpatient Yes

Patient EducationClinical

Spleen Diseases

Your spleen is an organ above your stomach and under your ribs on your left side. It is about as big as your fist. The spleen is part of your lymphatic system, which fights infection and keeps your body fluids in balance. It contains white blood cells that fight germs.

Read the full article at MedlinePlus

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

Convert S36.020A to ICD-9-CMHistory

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

ICD-9-CM
865.01 Spleen hematoma-closed
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 S36.020AOverview

Is S36.020A (Minor contusion of spleen) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report minor contusion of spleen, initial encounter on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What does the 7th character A in S36.020A mean?

The final character A marks the initial encounter: use it while the patient is receiving active treatment for minor contusion of spleen, such as an emergency visit or first evaluation.

What MS-DRG does S36.020A group to?

When minor contusion of spleen, initial encounter is the principal diagnosis on an inpatient stay, it groups to MS-DRG 814, 815, 816, 963, 964, 965, with relative weights from 0.6320 to 2.7338 depending on complications. Higher weights mean higher Medicare reimbursement.

What is the ICD-9 equivalent of S36.020A?

Under the General Equivalence Mappings, minor contusion of spleen, initial encounter converts to ICD-9-CM 865.01 (spleen hematoma-closed). 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.