2026 ICD-10-CM Diagnosis Code S37.12XAContusion of ureter, initial encounter

ICD-10-CM Codes›S00–T88›S30-S39›S37

ICD-10-CM S37.12XA
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

S37.12XA is a billable ICD-10-CM diagnosis code for contusion of ureter, 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 698 through 700, 963 through 965. Coders also document this condition as contusion of ureter. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Internal organ injury, initial encounter.

Code Identity

ICD-10-CM Code
S37.12XA
Billable Status
Yes — Valid for Submission
Code Describes
Contusion of ureter, initial encounter
Short Description
Contusion of ureter, initial encounter
Same as the full description in the CMS dataset.
Parent Code
S37.12
Contusion of ureter

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
CategoryS37Injury of urinary and pelvic organs
This CodeS37.12XAContusion of ureter, initial encounter

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Contusion of ureter

Coding GuidelinesGuidance

The appropriate 7th character is to be added to each code from block Injury of urinary and pelvic organs (S37). 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

Ureteral Disorders

Your kidneys make urine by filtering wastes and extra water from your blood. The urine travels from the kidneys to the bladder in two thin tubes called ureters.

Read the full article at MedlinePlus

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

Convert S37.12XA to ICD-9-CMHistory

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

ICD-9-CM
867.2 Ureter injury-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 S37.12XAOverview

Is S37.12XA (Contusion of ureter) a billable code?

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

What does the 7th character A in S37.12XA mean?

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

What MS-DRG does S37.12XA group to?

When contusion of ureter, initial encounter is the principal diagnosis on an inpatient stay, it groups to MS-DRG 698, 699, 700, 963, 964, 965, with relative weights from 0.6899 to 2.7338 depending on complications. Higher weights mean higher Medicare reimbursement.

What is the ICD-9 equivalent of S37.12XA?

Under the General Equivalence Mappings, contusion of ureter, initial encounter converts to ICD-9-CM 867.2 (ureter injury-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.