Z89.019 Acquired absence of unspecified thumb

Billable ICD-10-CM code, FY2026. Exempt from present-on-admission (POA) reporting.

Applies from Z89 Acquired absence of limb

Includes

• amputation status
• postprocedural loss of limb
• post-traumatic loss of limb

Excludes1 (never code together)

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

MS-DRG index

Defines the logic of DRG(s) 951 in MDC 23.

Approximate ICD-9-CM (GEMs)

• V49.61 Thumb amputation status (approximate)

Medicare Code Edits (MCE v43.1 (April 2026))

• Unacceptable principal diagnosis: These codes describe a circumstance which influences care but is not a current illness or injury, or capture only an underlying condition, and are unacceptable as principal diagnosis.

Code annotations containing back-references to Z89.019

Back-references to Z89.01

• Type 2 Excludes: Z89.02 Acquired absence of other finger(s) ("acquired absence of thumb (Z89.01-)")

Back-references to Z89

• Type 1 Excludes: M20 Acquired deformities of fingers and toes ("acquired absence of fingers and toes (Z89.-)")
• Type 1 Excludes: M21 Other acquired deformities of limbs ("acquired absence of limb (Z89.-)")
• Type 2 Excludes: M95 Other acquired deformities of musculoskeletal system and connective tissue ("acquired absence of limbs and organs (Z89-Z90)")
• Use Additional: Z47.81 Encounter for orthopedic aftercare following surgical amputation ("code to identify the limb amputated (Z89.-)")

Nearby codes

• Z89 Acquired absence of limb
• Z89.0 Acquired absence of thumb and other finger(s)
• Z89.01 Acquired absence of thumb
• Z89.011 Acquired absence of right thumb
• Z89.012 Acquired absence of left thumb
• Z89.019 Acquired absence of unspecified thumb (this code)
• Z89.02 Acquired absence of other finger(s)
• Z89.021 Acquired absence of right finger(s)
• Z89.022 Acquired absence of left finger(s)
• Z89.029 Acquired absence of unspecified finger(s)
• Z89.1 Acquired absence of hand and wrist