A66.6 — Bone and joint lesions of yaws
Is A66.6 billable?
Yes — A66.6 is billable for FY2027. A66.6 is a valid, billable ICD-10-CM code at the highest level of specificity in its branch. A66.6 may be submitted for encounters from October 1, 2026 through September 30, 2027.
A66.6 at a glance
| Code | A66.6 |
|---|---|
| Description | Bone and joint lesions of yaws |
| Billable | Yes |
| Code set | ICD-10-CM FY2027 |
| Valid for encounters | October 1, 2026 – September 30, 2027 |
Which MS-DRGs does A66.6 group to?
A66.6 sits in MDC 08 and helps define the logic of 3 MS-DRGs (version 44, FY2027). Which one a stay actually groups to also depends on procedures and secondary diagnoses.
- 548Septic Arthritis with MCCmedical
- 549Septic Arthritis with CCmedical
- 550Septic Arthritis without CC/MCCmedical
How is A66.6 listed in the Alphabetic Index?
These are the routes through the Alphabetic Index that lead to A66.6. They show the wording a clinician may have documented, which often differs from the Tabular description.
- Goundou
- Henpue, henpuye
- Ganglion › of yaws (compound) (diffuse) (joint) (tendon (sheath))
- Hydrarthrosis › of yaws
- Osteitis › due to yaws
- Periostitis › yaws (albuminosa) (circumscribed) (diffuse) (infective) (monomelic)
- Yaws › bone lesions
- Yaws › ganglion
- Yaws › hydrarthrosis
- Yaws › joint lesions
- Yaws › osteitis
- Yaws › periostitis
Inclusion terms
Alternative wording in documentation that is classified to A66.6.
- Yaws ganglion
- Yaws goundou
- Yaws gumma, bone
- Yaws gummatous osteitis or periostitis
- Yaws hydrarthrosis
- Yaws osteitis
- Yaws periostitis (hypertrophic)
Use additional code — inherited from Chapter 1
Report an additional code alongside A66.6 to fully describe the condition. A66.6 is sequenced first.
- code to identify resistance to antimicrobial drugs (Z16.-)
Excludes2 — not included here — inherited from Chapter 1
The conditions below are not part of A66.6, but a patient may have both at the same time. When documentation supports it, A66.6 and the excluded code may both be reported.
- carrier or suspected carrier of infectious disease (Z22.-)
- certain localized infections - see body system-related chapters
- infectious and parasitic diseases complicating pregnancy, childbirth and the puerperium (O98.-)
- infectious and parasitic diseases specific to the perinatal period (P35-P39)
- influenza and other acute respiratory infections (J00-J22)
Excludes2 — not included here — inherited from A65-A69
The conditions below are not part of A66.6, but a patient may have both at the same time. When documentation supports it, A66.6 and the excluded code may both be reported.
How long has A66.6 existed?
A66.6 has been in ICD-10-CM since at least FY2016, the earliest fiscal year on record here.
Derived from the official order files for FY2016–FY2026. FY2017 and FY2020 publish no order file, so those years are not covered.
Which codes are confused with A66.6?
ICD-10-CM declares these codes mutually exclusive with A66.6 — exactly one of each pair can be correct for a given encounter.