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ICD-10-CM 2027 diagnosis code

L66.89Other cicatricial alopecia

✓ Billable / specific

L66.89 is a valid, billable ICD-10-CM code for other cicatricial alopecia. It can be reported on claims for dates of service from October 1, 2026 – September 30, 2027.

Code last changed in FY2025 (effective October 1, 2024). Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data

About L66.89

L66.89 is the ICD-10-CM diagnosis code for other cicatricial alopecia. It belongs to category L66 (cicatricial alopecia [scarring hair loss]), block L60-L75 (disorders of skin appendages) and chapter 12 (diseases of the skin and subcutaneous tissue). It is billable, so it can be reported on its own for dates of service from October 1, 2026 through September 30, 2027.

Within L66.8, choose L66.89 (Other cicatricial alopecia) only when documentation doesn't support a more specific option: central centrifugal cicatricial alopecia (L66.81).

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 606 (Minor Skin Disorders with MCC, relative weight 1.5728) and DRG 607 (Minor Skin Disorders without MCC, relative weight 0.8772), in MDC 09 (Diseases and Disorders of the Skin, Subcutaneous Tissue and Breast), 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 was added in FY2025, effective October 1, 2024.

Notes that apply from higher levels

Instructions written at a parent level also apply to L66.89.

Broader instructions also apply from L60-L75 Disorders of skin appendages and Chapter 12: Diseases of the skin and subcutaneous tissue.

Alphabetic index entries

1 entries

Terms in the official ICD-10-CM index that lead to L66.89.

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.

MDC 09 · Diseases and Disorders of the Skin, Subcutaneous Tissue and Breast

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
  • FY2025 (effective 10/1/2024): Added
  • No changes since FY2025.

Common questions about L66.89

Is L66.89 billable?

Yes. L66.89 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).

Can L66.89 be used as a principal diagnosis?

Yes. The Medicare Code Editor doesn't restrict L66.89 as a principal diagnosis.

Is L66.89 a CC or MCC?

No. L66.89 is neither a CC nor an MCC under MS-DRG v44.0.

What DRG does L66.89 group to?

L66.89 is used in the MS-DRG v44.0 logic for MS-DRG 606 (Minor Skin Disorders with MCC) and MS-DRG 607 (Minor Skin Disorders without MCC). Which one applies depends on whether it is the principal diagnosis and on the rest of the claim.