Reduction defects of unspecified limb (Q73) ICD-10-CM
The Q73 code range covers reduction defects of unspecified limb with 4 ICD-10-CM diagnosis codes. 3 of them are billable and valid for claim submission in fiscal year 2026, and the category headers group them but cannot themselves be billed.
Codes in the Q73 Range 4 codes · 3 billable
Clinical Terms in This Code Range
Definitions from the National Library of Medicine for conditions coded in the Q73 range.
Anetoderma
Benign DERMATOSIS caused by a loss of dermal ELASTIC TISSUE resulting in localized sac-like areas of flaccid skin. It can be either primary (idiopathic) or secondary to other skin conditions, PENICILLAMINE use, or premature birth.
Ectromelia
Gross hypo- or aplasia of one or more long bones of one or more limbs. The concept includes amelia, hemimelia, phocomelia, and sirenomelia.
Ectromelia virus
A species of ORTHOPOXVIRUS infecting mice and causing a disease that involves internal organs and produces characteristic skin lesions.
Ectromelia, Infectious
A viral infection of mice, causing edema and necrosis followed by limb loss.
Orthopoxvirus
A genus of the family POXVIRIDAE, subfamily CHORDOPOXVIRINAE, comprising many species infecting mammals. Viruses of this genus cause generalized infections and a rash in some hosts. The type species is VACCINIA VIRUS.
About the Q73 Code Range
ICD-10 code Q73 addresses reduction defects of unspecified limbs, capturing congenital conditions where parts or whole limbs are missing or underdeveloped without specifying which limb. This category includes complete absence, such as amelia, and other complex malformations.
The section includes Q73.0 for congenital absence of unspecified limb(s), covering terms like "congenital complete absence of upper limb" and autosomal recessive amelia, thus coding for cases where a limb is entirely missing from birth. Q73.1 refers to phocomelia of unspecified limbs, which is a rare congenital condition characterized by severely shortened limbs and is linked to several syndromes including Roberts-SC and DK phocomelia syndromes. Q73.8 captures other limb reduction defects that do not fit the previous categories, such as micromelia, brachydactyly, symphalangism, and various complex syndromes involving limb shortening combined with other anomalies. These codes are essential for identifying and documenting congenital limb malformations when the affected limb is not specified.
Questions About This Page
How many billable codes are in the Q73 range?
Of the 4 codes in this range, 3 are billable and valid for claim submission from October 1, 2025 through September 30, 2026. Category header codes group them but cannot be reported on claims.
What does the Q73 range classify?
The range classifies reduction defects of unspecified limb. Each code links to its own reference page with billing status, MS-DRG grouping, coding notes, and clinical information.
Related References
Source: CMS FY 2026 ICD-10-CM Tabular List and order file, effective October 1, 2025 through September 30, 2026.
