A18.03 ICD-10-CM Code: Tuberculosis of other bones
A18.03 is not a CMS-HCC payment code. MEAT criteria · RAF calculator · HCC Buddy coding tools
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FY 2026 Apr update / Certain infectious and parasitic diseases (A00-B99) / Tuberculosis (A15-A19)
A18.03
Billable / SpecificICD-10-CMOfficial ICD-10-CMCodebook guidanceTuberculosis of other bones
This code describes tuberculosis infection that has spread to bones in the body other than the spine. Tuberculosis is a serious bacterial infection that typically affects the lungs but can spread to various bones, causing inflammation and damage.
CMS-HCC V28
N/A—
Not mapped
CMS-HCC V24
N/A—
Not mapped
ACA/HHS
N/A—
Not mapped
ESRD/PACE
N/A—
Not mapped
RXHCC
N/A—
Not mapped
Code Book Path
Inclusion Terms
Official- Tuberculous mastoiditis
- Tuberculous osteomyelitis
Excludes 2
OfficialICD-10-CM does not list Excludes 2 notes for A18.03 in this effective period.
Related Child Codes
Includes
OfficialICD-10-CM does not list Includes notes for A18.03 in this effective period.
Excludes 1
OfficialICD-10-CM does not list Excludes 1 notes for A18.03 in this effective period.
Code First
OfficialICD-10-CM does not list Code First sequencing instructions for A18.03 in this effective period.
Use Additional
OfficialICD-10-CM does not list Use Additional Code instructions for A18.03 in this effective period.
Code Also
OfficialICD-10-CM does not list Code Also instructions for A18.03 in this effective period.
Buddy Documentation Tip
Current with CMS: FY2026 ICD-10-CM Apr 1 update (effective Apr 1 – Sep 30, 2026) · CMS-HCC V28, 100% phased in for payment year 2026. FY2027 code set already staged for October 1, 2026. How HCC Buddy stays current →
Is A18.03 an HCC code?
No. A18.03 is a billable ICD-10-CM code but does not map to any HCC category in V28, V24, ESRD, or RxHCC.
- Code
- A18.03
- Description
- Tuberculosis of other bones
- HCC (V28)
- No CMS-HCC V28 mapping
- RAF
- —
- Billable
- Yes
- Payment year
- 2026
Coder workflow notes
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This code does not map to an HCC category in any model (V28, V24, ESRD, RxHCC).
What This Code Means
A18.03 is the ICD-10-CM diagnosis code for tuberculosis of other bones. This code describes tuberculosis infection that has spread to bones in the body other than the spine. Tuberculosis is a serious bacterial infection that typically affects the lungs but can spread to various bones, causing inflammation and damage. A18.03 sits in the ICD-10-CM chapter for certain infectious and parasitic diseases (a00-b99), within the section covering tuberculosis (a15-a19).
A18.03 is a billable ICD-10-CM code but does not map to a payment HCC under the CMS-HCC V28, V24, ESRD, or RxHCC risk adjustment models. It can be reported on Medicare Advantage encounter data submissions but it does not contribute to a beneficiary's RAF score and therefore does not affect risk-adjusted payments to the plan.
Use this code when TB affects bones excluding the spine (vertebrae); if spinal TB is documented, use A18.01 instead.
HCC Buddy maintains structured V28 and V24 mapping, RAF weights, and MEAT documentation criteria for A18.03 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.
Coding Tips
- •Use this code when TB affects bones excluding the spine (vertebrae); if spinal TB is documented, use A18.01 instead
- •Ensure documentation specifies which bone(s) are affected and confirm TB as the causative organism before coding; may require additional codes for site-specific manifestations