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ICD-10-CM 2027 diagnosis code

A66.8Latent yaws

✓ Billable / specific

A66.8 is a valid, billable ICD-10-CM code for latent yaws. It can be reported on claims for dates of service from October 1, 2026 – September 30, 2027.

Code unchanged since ICD-10-CM took effect on October 1, 2015. Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data

About A66.8

A66.8 is the ICD-10-CM diagnosis code for latent yaws. It belongs to category A66 (yaws), block A65-A69 (other spirochetal diseases) and chapter 1 (certain infectious and parasitic diseases). It is billable, so it can be reported on its own for dates of service from October 1, 2026 through September 30, 2027.

Within A66 (yaws), A66.8 is specifically for latent yaws. Related codes cover initial lesions of yaws (A66.0), multiple papillomata and wet crab yaws (A66.1), other early skin lesions of yaws (A66.2), Hyperkeratosis of yaws (A66.3), Gummata and ulcers of yaws (A66.4), Gangosa (A66.5), bone and joint lesions of yaws (A66.6), other manifestations of yaws (A66.7) and 1 more.

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 867 (Other Infectious and Parasitic Diseases Diagnoses with MCC, relative weight 2.1859), DRG 868 (Other Infectious and Parasitic Diseases Diagnoses with CC, relative weight 1.0235) and DRG 869 (Other Infectious and Parasitic Diseases Diagnoses without CC/MCC, relative weight 0.6787), in MDC 18 (Infectious and Parasitic Diseases, Systemic or Unspecified Sites), 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 has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.

Before ICD-10, this condition was coded in ICD-9-CM as 102.8 (latent yaws).

Coding notes

Applicable toConditions and synonyms classified to this code
  • Yaws without clinical manifestations, with positive serology

Notes that apply from higher levels

Instructions written at a parent level also apply to A66.8.

› From A66 Yaws
Includes
  • bouba
  • frambesia (tropica)
  • pian

Broader instructions also apply from A65-A69 Other spirochetal diseases and Chapter 1: Certain infectious and parasitic diseases.

Alphabetic index entries

1 entries

Terms in the official ICD-10-CM index that lead to A66.8.

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.

ICD-9-CM equivalent

Converter →

From the CMS 2018 General Equivalence Mappings (GEMs), the final GEMs release.

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
  • FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
  • No changes since FY2016.

Common questions about A66.8

Is A66.8 billable?

Yes. A66.8 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).

Can A66.8 be used as a principal diagnosis?

Yes. The Medicare Code Editor doesn't restrict A66.8 as a principal diagnosis.

Is A66.8 a CC or MCC?

No. A66.8 is neither a CC nor an MCC under MS-DRG v44.0.

What DRG does A66.8 group to?

A66.8 is used in the MS-DRG v44.0 logic for MS-DRG 867 (Other Infectious and Parasitic Diseases Diagnoses with MCC), MS-DRG 868 (Other Infectious and Parasitic Diseases Diagnoses with CC) and MS-DRG 869 (Other Infectious and Parasitic Diseases Diagnoses without CC/MCC). Which one applies depends on whether it is the principal diagnosis and on the rest of the claim.

What is the ICD-9 code for A66.8?

The CMS General Equivalence Mappings map A66.8 to ICD-9-CM 102.8.