A18.89 ICD-10-CM Code: Tuberculosis of other sites
HCC Buddy Code Card
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FY 2026 Apr update / Certain infectious and parasitic diseases (A00-B99) / Tuberculosis (A15-A19)
A18.89
Billable / SpecificICD-10-CMOfficial ICD-10-CMCodebook guidanceTuberculosis of other sites
This code is used when a patient has tuberculosis (TB) that affects parts of the body other than the lungs, such as bones, joints, lymph nodes, or other organs. It represents active TB infection in these less common locations.
CMS-HCC V28
00
RAF 0
CMS-HCC V24
00
RAF 0
ACA/HHS
00
RAF 0
ESRD/PACE
00
RAF 0
RXHCC
00
RAF 0
Code Trumping
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Code Book Path
Inclusion Terms
Official- Tuberculosis of muscle
- Tuberculous cerebral arteritis
Excludes 2
OfficialICD-10-CM does not list Excludes 2 notes for A18.89 in this effective period.
Related Child Codes
Includes
OfficialICD-10-CM does not list Includes notes for A18.89 in this effective period.
Excludes 1
OfficialICD-10-CM does not list Excludes 1 notes for A18.89 in this effective period.
Code First
OfficialICD-10-CM does not list Code First sequencing instructions for A18.89 in this effective period.
Use Additional
OfficialICD-10-CM does not list Use Additional Code instructions for A18.89 in this effective period.
Code Also
OfficialICD-10-CM does not list Code Also instructions for A18.89 in this effective period.
Buddy Documentation Tip
Last updated: FY2026 ICD-10-CM Apr update, Apr 1, 2026 through Sep 30, 2026. CMS-HCC V28 is 100% phased in for payment year 2026.
Is A18.89 an HCC code?
No. A18.89 is a billable ICD-10-CM code but does not map to any HCC category in V28, V24, ESRD, or RxHCC.
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
A18.89 is the ICD-10-CM diagnosis code for tuberculosis of other sites. This code is used when a patient has tuberculosis (TB) that affects parts of the body other than the lungs, such as bones, joints, lymph nodes, or other organs. It represents active TB infection in these less common locations. A18.89 sits in the ICD-10-CM chapter for certain infectious and parasitic diseases (a00-b99), within the section covering tuberculosis (a15-a19).
A18.89 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.
Always verify the specific site of TB infection in the documentation, as more specific codes (like A18.0 for TB of bones/joints or A18.1 for TB of genitourinary system) should be used when the site is clearly documented.
HCC Buddy maintains structured V28 and V24 mapping, RAF weights, and MEAT documentation criteria for A18.89 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.
Coding Tips
- •Always verify the specific site of TB infection in the documentation, as more specific codes (like A18.0 for TB of bones/joints or A18.1 for TB of genitourinary system) should be used when the site is clearly documented
- •This code should only be used when the TB site does not fit into other more specific A18 subcategories; review the complete A18 category to ensure the most specific code is selected