2026 ICD-10-CM Diagnosis Code N83.12Corpus luteum cyst of left ovary

ICD-10-CM Codes›N00–N99›N80-N98›N83

ICD-10-CM N83.12
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

N83.12 is a billable ICD-10-CM diagnosis code for corpus luteum cyst of left ovary. 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 Benign ovarian cyst.

Code Identity

ICD-10-CM Code
N83.12
Billable Status
Yes — Valid for Submission
Code Describes
Corpus luteum cyst of left ovary
Short Description
Corpus luteum cyst of left ovary
Same as the full description in the CMS dataset.
Parent Code
N83.1
Corpus luteum cyst

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 CodeN83.12Corpus luteum cyst of left ovary

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Bilateral cyst of corpus luteum of ovaries
  • Bilateral hemorrhagic corpus luteum cysts
  • Corpus luteum cyst
  • Cyst of bilateral ovaries
  • Cyst of corpus luteum of left ovary
  • Cyst of corpus luteum of right ovary
  • Hemorrhage of corpus luteum cyst
  • Hemorrhage of left corpus luteum cyst
  • Hemorrhage of right corpus luteum cyst
  • Hemorrhagic cyst of ovary

Clinical ClassificationClinical

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

CCSR GEN022
Benign ovarian cyst
Default principal diagnosis: inpatient Yes · outpatient Yes

Clinical InformationClinical

  • Corpus Luteum Cyst

    a benign ovarian cyst that develops when fluid accumulates in a corpus luteum that failed to regress.

Patient EducationClinical

Ovarian Cysts

The ovaries are part of the female reproductive system. They produce a woman's eggs and make female hormones. Ovarian cysts are fluid-filled sacs in or on an ovary. They usually form during ovulation, when the ovary releases an egg. They are usually harmless and go away by themselves. Most women have them sometime during their lives.

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Convert N83.12 to ICD-9-CMHistory

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

ICD-9-CM
620.1 Corpus luteum cyst
Approximate The match is approximate rather than exact.

Code History & ChangesHistory

Replacement N83.12 replaces the following previously assigned code(s):

  • N83.1 - Corpus luteum cyst
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 N83.12Overview

Is N83.12 (Corpus luteum cyst) a billable code?

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

What MS-DRG does N83.12 group to?

When corpus luteum cyst of left ovary 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 N83.12?

Under the General Equivalence Mappings, corpus luteum cyst of left ovary converts to ICD-9-CM 620.1 (corpus luteum cyst). 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.