2027 ICD-10-CM Diagnosis Code N80.A42Superficial endometriosis of left ureter

ICD-10-CM Codes›N00–N99›N80-N98›N80

ICD-10-CM N80.A42
CMSSource: CMS FY 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

N80.A42 is a billable ICD-10-CM diagnosis code for superficial endometriosis of left ureter. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 698 through 700. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Endometriosis.

Code Identity

ICD-10-CM Code
N80.A42
Billable Status
Yes — Valid for Submission
Code Describes
Superficial endometriosis of left ureter
Short Description
Superficial endometriosis of left ureter
Same as the full description in the CMS dataset.
Parent Code
N80.A4
Superficial endometriosis of ureter

Code Classification

ChapterN00–N99Diseases of the genitourinary system
SectionN80-N98Noninflammatory disorders of female genital tract
CategoryN80Endometriosis
This CodeN80.A42Superficial endometriosis of left ureter

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to N80.A42: its own notes plus those printed at N80.A4 and Chapter 14. A note printed at a category, block or chapter applies to every code under it.

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)

Code Also

A second code may be needed to fully describe the condition; the note gives no sequencing direction.

From N80.A4 Superficial endometriosis of ureter applies to 4 codes
  • if applicable, obstructive and reflux uropathy (N13.-)

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.A42, its category, or a range that includes it.

Excludes1 1

These codes carry an Excludes1 note naming N80.A42: 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

Clinical ClassificationClinical

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

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

Clinical InformationClinical

  • Endometriosis

    a condition in which functional endometrial tissue is present outside the uterus. it is often confined to the pelvis involving the ovary, the ligaments, cul-de-sac, and the uterovesical peritoneum.

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.A42 replaces the following previously assigned code(s):

  • N80.8 - Other endometriosis
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.A42Overview

What is the ICD-10 code for superficial endometriosis of left ureter?

The ICD-10-CM code for superficial endometriosis of left ureter is N80.A42 (sometimes written as N80A42). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

Is N80.A42 (Superficial endometriosis of ureter) a billable code?

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

What MS-DRG does N80.A42 group to?

When superficial endometriosis of left ureter is the principal diagnosis on an inpatient stay, it groups to MS-DRG 699, 698, 700, with relative weights from 0.6740 to 1.6400 depending on complications. Higher weights mean higher Medicare reimbursement.