2026 ICD-10-CM Diagnosis Code N83.529Torsion of fallopian tube, unspecified side

ICD-10-CM Codes›N00–N99›N80-N98›N83

ICD-10-CM N83.529
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

N83.529 is a billable ICD-10-CM diagnosis code for torsion of fallopian tube, unspecified side. 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. The code is flagged as an unspecified code, since codes identifying laterality exist in the same family. Coders also document this condition as accessory fallopian tube. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Other specified female genital disorders.

Code Identity

ICD-10-CM Code
N83.529
Billable Status
Yes — Valid for Submission
Code Describes
Torsion of fallopian tube, unspecified side
Short Description
Torsion of fallopian tube, unspecified side
Same as the full description in the CMS dataset.
Parent Code
N83.52
Torsion of fallopian tube

Code Classification

ChapterN00–N99Diseases of the genitourinary system
SectionN80-N98Noninflammatory disorders of female genital tract
CategoryN83Noninflammatory disorders of ovary, fallopian tube and broad ligament
This CodeN83.529Torsion of fallopian tube, unspecified side

Code EditsBilling

Medicare Code Editor checks that affect claim validity for N83.529.

Unspecified codes
Unspecified codes exist in the ICD-10-CM classification for circumstances when documentation in the medical record does not provide the level of detail needed to support reporting a more specific code. However, in the inpatient setting, there should generally be very limited and rare circumstances for which the laterality (right, left, bilateral) of a condition is unable to be documented and reported. The following pages contain the list of unspecified ICD-10-CM diagnosis codes for which there is a more specific code to identify laterality (right, left, bilateral) within that code family.

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Accessory fallopian tube
  • Torsion of accessory fallopian tube
  • Torsion of fallopian tube

Tabular List NotesGuidance

Coding notes and annotation back-references applicable to this code.

Inclusion Terms

  • Torsion of fallopian tube, NOS

Clinical ClassificationClinical

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

CCSR GEN025
Other specified female genital disorders
Default principal diagnosis: inpatient Yes · outpatient Yes

Convert N83.529 to ICD-9-CMHistory

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

ICD-9-CM
620.5 Torsion of ovary or tube
Approximate The match is approximate rather than exact.

Code History & ChangesHistory

Replacement N83.529 replaces the following previously assigned code(s):

  • N83.52 - Torsion of fallopian tube
FY 2018AddedAdded to the ICD-10-CM code setEffective October 1, 2017.
FY 2019–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About N83.529Overview

Is N83.529 (Torsion of fallopian tube) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report torsion of fallopian tube, unspecified side on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does N83.529 group to?

When torsion of fallopian tube, unspecified side 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 N83.529?

Under the General Equivalence Mappings, torsion of fallopian tube, unspecified side converts to ICD-9-CM 620.5 (torsion of ovary or tube). 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.