2026 ICD-10-CM Diagnosis Code S37.401AUnspecified injury of ovary, unilateral, initial encounter
S37.401A is a billable ICD-10-CM diagnosis code for unspecified injury of ovary, unilateral, 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 742 through 743, 760 through 761. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Internal organ injury, initial encounter.
Code Identity
Code Classification
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.
Patient EducationClinical
Ovarian Disorders
The ovaries are a pair of female reproductive glands that make eggs and female hormones. Women have one ovary on each side of the uterus (where a fetus grows during pregnancy). Each ovary is about the size and shape of an almond.
The full article covers:
- What are ovaries?
- What are the types of ovarian disorders?
- What causes ovarian disorders?
- What are the symptoms of ovarian disorders?
- How are ovarian disorders diagnosed?
- What are the treatments for ovarian disorders?
Read the full article at MedlinePlus
Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.
Convert S37.401A to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About S37.401AOverview
Is S37.401A (Unspecified injury of ovary, unilateral) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report unspecified injury of ovary, unilateral, initial encounter on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
What does the 7th character A in S37.401A mean?
The final character A marks the initial encounter: use it while the patient is receiving active treatment for unspecified injury of ovary, unilateral, such as an emergency visit or first evaluation.
What MS-DRG does S37.401A group to?
When unspecified injury of ovary, unilateral, initial encounter is the principal diagnosis on an inpatient stay, it groups to MS-DRG 742, 743, 760, 761, with relative weights from 0.5696 to 1.8348 depending on complications. Higher weights mean higher Medicare reimbursement.
What is the ICD-9 equivalent of S37.401A?
Under the General Equivalence Mappings, unspecified injury of ovary, unilateral, initial encounter converts to ICD-9-CM 867.6 (pelvic organ inj NEC-cl). 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.
