A66.0 – Initial lesions of yaws

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

Billable code

ICD-10-CM code A66.0

Code: A66.0 (claims format: A660)
Description: Initial lesions 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 A66.0

Applicable to:

Chancre of yaws
Frambesia, initial or primary
Initial frambesial ulcer
Mother yaw

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 A66.0

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

Related codes in A66

A66.1 – Multiple papillomata and wet crab yawsBillable
A66.2 – Other early skin lesions of yawsBillable
A66.3 – Hyperkeratosis 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 A66.0?

A66.0 is the ICD-10-CM code for initial lesions of yaws, in the block A65-A69 (Other spirochetal diseases).

Is A66.0 a billable code?

Yes. A66.0 is a billable/specific code that can be used to indicate a diagnosis for reimbursement purposes.

What category does A66.0 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.