2027 ICD-10-CM Diagnosis Code N80.03Adenomyosis of the uterus

ICD-10-CM Codes›N00–N99›N80-N98›N80

ICD-10-CM N80.03
CMSSource: CMS FY 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

N80.03 is a billable ICD-10-CM diagnosis code for adenomyosis of the uterus. 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. Coders also document this condition as abnormal uterine bleeding due to adenomyosis. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Endometriosis.

Code Identity

ICD-10-CM Code
N80.03
Billable Status
Yes — Valid for Submission
Code Describes
Adenomyosis of the uterus
Short Description
Adenomyosis of the uterus
Same as the full description in the CMS dataset.
Parent Code
N80.0
Endometriosis of uterus

Code Classification

ChapterN00–N99Diseases of the genitourinary system
SectionN80-N98Noninflammatory disorders of female genital tract
CategoryN80Endometriosis
This CodeN80.03Adenomyosis of the uterus

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Abnormal uterine bleeding due to adenomyosis
  • Uterine adenomyosis

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to N80.03: its own notes plus those printed at N80.0 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.

  • Adenomyosis NOS

Excludes1

Not coded here: the excluded code is never reported together with this one, unless the two conditions are unrelated.

From N80.0 Endometriosis of uterus applies to 4 codes
  • stromal endometriosis (D39.0)

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 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.

Referenced in Other NotesGuidance

Instructional notes printed at other codes that name N80.03, its category, or a range that includes it.

Excludes1 1

These codes carry an Excludes1 note naming N80.03: they are not reported together with it, unless the two conditions are unrelated.

  • N85 Other noninflammatory disorders of uterus, except cervix
    endometriosis (N80.-) names N80.-, which includes this code

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

Clinical ClassificationClinical

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

CCSR GEN019
Endometriosis
Default principal diagnosis: inpatient Yes · outpatient Yes

Clinical InformationClinical

  • Adenomyosis

    the extension of endometrial tissue (endometrium) into the myometrium. it usually occurs in women in their reproductive years and may result in a diffusely enlarged uterus with ectopic and benign endometrial glands and stroma.

Patient EducationClinical

Endometriosis

The uterus, or womb, is the place where a fetus grows during pregnancy. The uterus is lined with tissue (endometrium). Endometriosis is a disease in which tissue like the lining of the uterus grows in other places in your body. These patches of tissue are called "implants," "nodules," or "lesions." They are most often found:

The full article covers:

  • What is endometriosis?
  • What causes endometriosis?
  • Who is at risk for endometriosis?
  • What are the symptoms of endometriosis?
  • How is endometriosis diagnosed?
  • What are the treatments for endometriosis?

Read the full article at MedlinePlus

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

Code History & ChangesHistory

Replacement N80.03 replaces the following previously assigned code(s):

  • N80.0 - Endometriosis of uterus
FY 2023AddedAdded to the ICD-10-CM code setEffective October 1, 2022.
FY 2024–2026No changes
FY 2027CurrentCurrent code set, no changesEffective October 1, 2026 through September 30, 2027.

Questions About N80.03Overview

What is the ICD-10 code for adenomyosis of the uterus?

The ICD-10-CM code for adenomyosis of the uterus is N80.03 (sometimes written as N8003). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

Is N80.03 (Endometriosis of uterus) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report adenomyosis of the uterus on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

What MS-DRG does N80.03 group to?

When adenomyosis of the uterus 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.

Can N80.03 be reported with D39.0?

Not as a rule. The Excludes1 note at N80.0, which applies to N80.03, lists "stromal endometriosis (D39.0)". An Excludes1 note means the excluded code is never reported together with this one; the only exception is when the two conditions are unrelated to each other (Official Guidelines, Section I.A.12.a).