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Z89.449

Z89.449: Acquired absence of unspecified ankle

Billable / specific codeICD-10-CMPOA exemptunspecified

Z89.449 is a billable, specific ICD-10-CM code for acquired absence of unspecified ankle. It is valid for submission on a claim.

Check Z89.449 with the rest of the claim: free scrubber

Excludes1 inherited from the categories above Z89.449

A category’s note binds every code beneath it.

Written on Z89: Acquired absence of limb

  • acquired deformities of limbs (M20-M21)
  • congenital absence of limbs (Q71-Q73)

Other codes that can never be billed with Z89.449

Their own Excludes1 notes name this code, so the conflict is not listed above.

  • M20Acquired deformities of fingers and toes
  • M21Other acquired deformities of limbs

Risk adjustment

Z89.449 risk-adjusts. Under the CMS-HCC V28 model it maps to this category:

  • HCC 409 Amputation Status, Lower Limb/Amputation Complications0.598 RAF

Coefficient shown for the Community Non-dual Aged segment. A higher HCC in the same hierarchy will suppress this one, so capturing it does not always add score. Look up the whole chart to see which of its HCCs the hierarchy would zero.

Code history

Unchanged in every release from FY2024 to FY2027.

Other codes under Z89.44

ICD-10-CMFY2027· effective October 1, 2026

Loaded directly from the CMS/NCHS ICD-10-CM public-domain release: see data sources and our editorial policy. If this page disagrees with the CMS tabular list, this page is wrong. Reference information for professional coders; not medical or billing advice.