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ICD-10-CM 2027 diagnosis code

N80.B39Endometriosis of diaphragm, unspecified depth

✓ Billable / specificFemale only

N80.B39 is a valid, billable ICD-10-CM code for endometriosis of diaphragm, unspecified depth. It can be reported on claims for dates of service from October 1, 2026 – September 30, 2027.

Looking up by condition? See ICD-10 code for Diaphragm endometriosis.

Code last changed in FY2023 (effective October 1, 2022). Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data

About N80.B39

N80.B39 is the ICD-10-CM diagnosis code for endometriosis of diaphragm, unspecified depth. It belongs to category N80 (endometriosis), block N80-N98 (noninflammatory disorders of female genital tract) and chapter 14 (diseases of the genitourinary system). It is billable, so it can be reported on its own for dates of service from October 1, 2026 through September 30, 2027.

Within N80.B3, choose N80.B39 (unspecified depth) only when documentation doesn't support a more specific option: superficial endometriosis of diaphragm (N80.B31) and deep endometriosis of diaphragm (N80.B32).

It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.

In MS-DRG v44.0, it is part of the grouping logic for DRG 205 (Other Respiratory System Diagnoses with MCC, relative weight 1.8244) and DRG 206 (Other Respiratory System Diagnoses without MCC, relative weight 0.9257), in MDC 04 (Diseases and Disorders of the Respiratory System), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.

It is on the CMS list of diagnoses consistent only with female patients (the sex-conflict edit itself was retired in FY2025).

It was added in FY2023, effective October 1, 2022.

Coding notes

Applicable toConditions and synonyms classified to this code
  • Endometriosis of the diaphragm NOS

Notes that apply from higher levels

Instructions written at a parent level also apply to N80.B39.

› From N80.B Endometriosis of cardiothoracic space
Code also
  • , if applicable:
  • catamenial hemothorax (J94.2)
  • catamenial pneumothorax (J93.12)

Broader instructions also apply from Chapter 14: Diseases of the genitourinary system.

Alphabetic index entries

2 entries

Terms in the official ICD-10-CM index that lead to N80.B39.

MS-DRG v44.0 grouping

All DRGs →

Inpatient MS-DRGs this diagnosis can group to, as the principal or a secondary diagnosis, depending on the rest of the claim.

Code history

  1. 2016
  2. 2017
  3. 2018
  4. 2019
  5. 2020
  6. 2021
  7. 2022
  8. 2023
  9. 2024
  10. 2025
  11. 2026
  12. 2027
  • FY2023 (effective 10/1/2022): Added
  • No changes since FY2023.

Common questions about N80.B39

Is N80.B39 billable?

Yes. N80.B39 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).

Can N80.B39 be used as a principal diagnosis?

Yes. The Medicare Code Editor doesn't restrict N80.B39 as a principal diagnosis.

Is N80.B39 a CC or MCC?

No. N80.B39 is neither a CC nor an MCC under MS-DRG v44.0.

What DRG does N80.B39 group to?

N80.B39 is used in the MS-DRG v44.0 logic for MS-DRG 205 (Other Respiratory System Diagnoses with MCC) and MS-DRG 206 (Other Respiratory System Diagnoses without MCC). Which one applies depends on whether it is the principal diagnosis and on the rest of the claim.