2026 ICD-10-CM Diagnosis Code N99.83Residual ovary syndrome

ICD-10-CM Codes›N00–N99›N99›N99

ICD-10-CM N99.83
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

N99.83 is a billable ICD-10-CM diagnosis code for residual ovary syndrome. 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 ovarian remnant syndrome. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Postprocedural or postoperative genitourinary system complication.

Code Identity

ICD-10-CM Code
N99.83
Billable Status
Yes — Valid for Submission
Code Describes
Residual ovary syndrome
Short Description
Residual ovary syndrome
Same as the full description in the CMS dataset.
Parent Code
N99.8
Other intraoperative and postprocedural complications and disorders of genitourinary system

Code Classification

ChapterN00–N99Diseases of the genitourinary system
SectionN99Intraoperative and postprocedural complications and disorders of genitourinary system, not elsewhere classified
CategoryN99Intraoperative and postprocedural complications and disorders of genitourinary system, not elsewhere classified
This CodeN99.83Residual ovary syndrome

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Ovarian remnant syndrome
  • Residual ovary syndrome

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

External Cause of Injuries IndexGuidance

References for this code in the External Cause of Injuries Index.

    • Residual
      • ovary syndrome
    • Retention
      • ovary syndrome
    • Syndrome
      • residual ovary

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR GEN026
Postprocedural or postoperative genitourinary system complication
Default principal diagnosis: inpatient Yes · outpatient Yes

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 N99.83 to ICD-9-CMHistory

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

ICD-9-CM
620.8 Noninfl dis ova/adnx NEC
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 N99.83Overview

Is N99.83 a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report residual ovary syndrome on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does N99.83 group to?

When residual ovary syndrome 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 N99.83?

Under the General Equivalence Mappings, residual ovary syndrome converts to ICD-9-CM 620.8 (noninfl dis ova/adnx NEC). 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.