2027 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 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

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 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 742 through 743, 760 through 761. As a secondary diagnosis, it counts as a complication or comorbidity (CC) and moves an inpatient stay to a higher severity level within its MS-DRG family. It does not count, however, when the principal diagnosis is one of 36 closely related codes. 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

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to N83.529: its own notes plus those printed at N83 and Chapter 14. A note printed at a category, block or chapter applies to every code under it.

Applicable To

Conditions this code is used for: synonyms of the title or, for "other specified" codes, the conditions assigned to it. The list is not exhaustive.

  • Torsion of fallopian tube, NOS

Excludes2

Not included here: the excluded condition is not part of this code, but a patient may have both, so both codes may be reported.

From N83 Noninflammatory disorders of ovary, fallopian tube and broad ligament applies to 35 codes
From Chapter 14 (N00-N99) Diseases of the genitourinary system applies to 838 codes
  • certain conditions originating in the perinatal period (P04-P96)
  • certain infectious and parasitic diseases (A00-B99)
  • complications of pregnancy, childbirth and the puerperium (O00-O9A)
  • congenital malformations, deformations and chromosomal abnormalities (Q00-Q99)
  • endocrine, nutritional and metabolic diseases (E00-E88)
  • injury, poisoning and certain other consequences of external causes (S00-T88)
  • neoplasms (C00-D49)
  • symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)

Source: CMS ICD-10-CM Tabular List. How to read instructional notes.

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 2019AddedAdded to the ICD-10-CM code setEffective October 1, 2018.
FY 2020–2026No changes
FY 2027CurrentCurrent code set, no changesEffective October 1, 2026 through September 30, 2027.

Questions About N83.529Overview

What is the ICD-10 code for torsion of fallopian tube, unspecified side?

The ICD-10-CM code for torsion of fallopian tube, unspecified side is N83.529 (sometimes written as N83529). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

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, 2026 through September 30, 2027.

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 0.7039 to 1.8448 depending on complications. Higher weights mean higher Medicare reimbursement.

Is N83.529 a CC or MCC?

CMS lists N83.529 as a CC (complication or comorbidity) for FY 2027. Reported as a secondary diagnosis, it moves the inpatient stay to a higher-weighted DRG within its severity family. It does not count when the principal diagnosis is one of the 36 closely related codes in its exclusion list.

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.