2027 ICD-10-CM Diagnosis Code N85.02Endometrial intraepithelial neoplasia [EIN]

ICD-10-CM Codes›N00–N99›N80-N98›N85

ICD-10-CM N85.02
CMSSource: CMS FY 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

N85.02 is a billable ICD-10-CM diagnosis code for endometrial intraepithelial neoplasia [EIN]. 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. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Other specified female genital disorders.

Code Identity

ICD-10-CM Code
N85.02
Billable Status
Yes — Valid for Submission
Code Describes
Endometrial intraepithelial neoplasia [EIN]
Short Description
Endometrial intraepithelial neoplasia [EIN]
Same as the full description in the CMS dataset.
Parent Code
N85.0
Endometrial hyperplasia

Code Classification

ChapterN00–N99Diseases of the genitourinary system
SectionN80-N98Noninflammatory disorders of female genital tract
CategoryN85Other noninflammatory disorders of uterus, except cervix
This CodeN85.02Endometrial intraepithelial neoplasia [EIN]

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Abnormal uterine bleeding due to atypical endometrial hyperplasia
  • Abnormal uterine bleeding due to endometrial disorder
  • Abnormal uterine bleeding due to endometrial hyperplasia
  • Abnormal uterine bleeding due to endometrial intraepithelial neoplasia
  • Atypical endometrial hyperplasia
  • Benign endometrial hyperplasia
  • Complex atypical endometrial hyperplasia
  • Complex endometrial hyperplasia
  • Endometrial hyperplasia
  • Endometrial intraepithelial neoplasia
  • Simple atypical endometrial hyperplasia
  • Simple endometrial glandular hyperplasia with atypia
  • Simple endometrial hyperplasia

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to N85.02: its own notes plus those printed at N85 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.

  • Endometrial hyperplasia with atypia

Excludes1

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

On N85.02 itself
  • malignant neoplasm of endometrium (with endometrial intraepithelial neoplasia [EIN]) (C54.1)
From N85 Other noninflammatory disorders of uterus, except cervix applies to 12 codes
  • endometriosis (N80.-)
  • inflammatory diseases of uterus (N71.-)
  • noninflammatory disorders of cervix, except malposition (N86-N88)
  • polyp of corpus uteri (N84.0)
  • uterine prolapse (N81.-)

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 N85.02, its category, or a range that includes it.

Excludes1 2

These codes carry an Excludes1 note naming N85.02: they are not reported together with it, unless the two conditions are unrelated.

  • N71 Inflammatory disease of uterus, except cervix
    hyperplastic endometritis (N85.0-) names N85.0-, which includes this code
  • N84.0 Polyp of corpus uteri
    polypoid endometrial hyperplasia (N85.0-) names N85.0-, 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 GEN025
Other specified female genital disorders
Default principal diagnosis: inpatient Yes · outpatient Yes

Clinical InformationClinical

  • Atypical Endometrial Hyperplasia

    a neoplastic clonal expansion of endometrial glands characterized by cytologic changes of the epithelium and the presence of an increased number of endometrial glands. the glands form crowded aggregates with tubular or branching patterns which are cytologically distinct from the background architectural and cytological pattern. it is associated with molecular changes seen in endometrioid endometrial carcinoma, including microsatellite instability, pax2 inactivation, and pten, kras, and ctnnb1 gene mutations.

  • Endometrial Hyperplasia

    benign proliferation of the endometrium in the uterus. endometrial hyperplasia is classified by its cytology and glandular tissue. there are simple, complex (adenomatous without atypia), and atypical hyperplasia representing also the ascending risk of becoming malignant.

Patient EducationClinical

Uterine Diseases

The uterus, or womb, is the place where a fetus grows during pregnancy. Uterine diseases are conditions that affect the uterus. These diseases can be benign (not cancer) or malignant (cancerous). They may affect your menstrual periods, your ability to get pregnant, or the health of your reproductive organs.

The full article covers:

  • What are uterine diseases?
  • What causes uterine diseases?
  • What are the symptoms of uterine diseases?
  • How are uterine diseases diagnosed?
  • What are the treatments for uterine diseases?

Read the full article at MedlinePlus

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

Convert N85.02 to ICD-9-CMHistory

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

ICD-9-CM
621.33 Endomet hyperpla w atyp
Approximate The match is approximate rather than exact.
ICD-9-CM
621.35 Endomet intraepithl neop
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 2017–2026No changes
FY 2027CurrentCurrent code set, no changesEffective October 1, 2026 through September 30, 2027.

Questions About N85.02Overview

What is the ICD-10 code for endometrial intraepithelial neoplasia [EIN]?

The ICD-10-CM code for endometrial intraepithelial neoplasia [EIN] is N85.02 (sometimes written as N8502). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

Is N85.02 (Endometrial hyperplasia) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report endometrial intraepithelial neoplasia [EIN] on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

What MS-DRG does N85.02 group to?

When endometrial intraepithelial neoplasia [EIN] 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 N85.02 be reported with C54.1?

Not as a rule. The Excludes1 note on N85.02 lists "malignant neoplasm of endometrium (with endometrial intraepithelial neoplasia [EIN]) (C54.1)". 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).

What is the ICD-9 equivalent of N85.02?

Under the General Equivalence Mappings, endometrial intraepithelial neoplasia [EIN] converts to ICD-9-CM 621.33 (endomet hyperpla w atyp) and 621.35 (endomet intraepithl neop). The mapping is approximate, so confirm the match fits the documentation.