A66.3 – Hyperkeratosis of yaws

ICD-10-CM 2027 diagnosis code · Other spirochetal diseases

Billable code

ICD-10-CM code A66.3

Code: A66.3 (claims format: A663)
Description: Hyperkeratosis of yaws
Billable: Yes – valid for HIPAA-covered transactions
Valid for: Dates of service October 1, 2026 – September 30, 2027 (FY2027)
Chapter: 1. Certain infectious and parasitic diseases (A00-B99)
Block: A65-A69 Other spirochetal diseases
Parent codes: A66

Notes for A66.3

Applicable to:

Ghoul hand
Hyperkeratosis, palmar or plantar (early) (late) due to yaws
Worm-eaten soles

Notes inherited from parent codes

Instructional notes at a category or block level apply to every code below it.

A66 – Yaws

Includes:

bouba
frambesia (tropica)
pian

Block A65-A69

Excludes2 (not included here):

leptospirosis (A27.-)
syphilis (A50-A53)

Index terms for A66.3

Entries in the ICD-10-CM alphabetic index that lead to this code:

Related codes in A66

A66.0 – Initial lesions of yawsBillable
A66.1 – Multiple papillomata and wet crab yawsBillable
A66.2 – Other early skin lesions of yawsBillable
A66.4 – Gummata and ulcers of yawsBillable
A66.5 – GangosaBillable
A66.6 – Bone and joint lesions of yawsBillable
A66.7 – Other manifestations of yawsBillable
A66.8 – Latent yawsBillable
A66.9 – Yaws, unspecifiedBillable

Frequently asked questions

What is ICD-10 code A66.3?

A66.3 is the ICD-10-CM code for hyperkeratosis of yaws, in the block A65-A69 (Other spirochetal diseases).

Is A66.3 a billable code?

Yes. A66.3 is a billable/specific code that can be used to indicate a diagnosis for reimbursement purposes.

What category does A66.3 belong to?

It belongs to category A66 – Yaws.

Source: CDC/NCHS ICD-10-CM FY2027 code files, tabular list and index. Reference only – code assignment must follow the official ICD-10-CM guidelines and documentation in the medical record.