2026 ICD-10-CM Diagnosis Code N85.3Subinvolution of uterus
ICD-10-CM Codes›N00–N99›N80-N98›N85
- Billable — Valid for Submission
- Chronic Condition
N85.3 is a billable ICD-10-CM diagnosis code for subinvolution of uterus. 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. Coders also document this condition as chronic subinvolution of uterus. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Other specified female genital disorders.
Code Identity
Code Classification
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Chronic subinvolution of uterus
Tabular List NotesGuidance
Coding notes and annotation back-references applicable to this code.
Type 1 Excludes
- puerperal subinvolution of uterus O90.89
A type 1 excludes note is a pure excludes note. It means "NOT CODED HERE!" An Excludes1 note indicates that the code excluded should never be used at the same time as the code above the Excludes1 note. An Excludes1 is used when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.
Index to Diseases and InjuriesGuidance
Alphabetical index entries that point to this code.
- Bleeding - See Also: Hemorrhage;
- due to uterine subinvolution - N85.3
- with subinvolution - N85.3
- uterus (chronic) (nonpuerperal) - N85.3
External Cause of Injuries IndexGuidance
References for this code in the External Cause of Injuries Index.
- Bleeding
- due to uterine subinvolution
- Congestion, congestive
- uterus
- with subinvolution
- Subinvolution
- uterus (chronic) (nonpuerperal)
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Patient EducationClinical
Uterine Diseases
The uterus, or womb, is the place where a fetus grows during pregnancy. Uterine diseases are conditions that affect the uterus. These diseases can be benign (not cancer) or malignant (cancerous). They may affect your menstrual periods, your ability to get pregnant, or the health of your reproductive organs.
The full article covers:
- What are uterine diseases?
- What causes uterine diseases?
- What are the symptoms of uterine diseases?
- How are uterine diseases diagnosed?
- What are the treatments for uterine diseases?
Read the full article at MedlinePlus
Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.
Convert N85.3 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About N85.3Overview
Is N85.3 (Other noninflammatory disorders of uterus, except cervix) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report subinvolution of uterus on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
What MS-DRG does N85.3 group to?
When subinvolution of uterus 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 N85.3?
Under the General Equivalence Mappings, subinvolution of uterus converts to ICD-9-CM 621.1 (chr uterine subinvolutn). The mapping is approximate, so confirm the match fits the documentation.
Footnotes
[1] Chronic - a chronic condition code indicates a condition lasting 12 months or longer and its effect on the patient based on one or both of the following criteria:
- The condition results in the need for ongoing intervention with medical products,treatment, services, and special equipment
- The condition places limitations on self-care, independent living, and social interactions.
