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    v1.0.28
    OpenPayerBilling CodesCongenital malformations and deformations of the musculoskeletal systemICD-10-CM q73-reduction-defects-of-unspecified-limb
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    ICD-10-CM Code For Reduction Defects Of Unspecified Limb: Group Overview

    The International Classification of Diseases, Tenth Revision, Clinical Modification (ICD-10-CM) code group Q73 includes congenital reduction defects of unspecified limbs, such as transverse or longitudinal deficiencies and partial absence of limb segments present at birth. These ICD-10-CM diagnosis codes are used to document clinical scenarios involving congenital limb reduction, capturing the extent of limb deficiency, laterality, and associated functional impact. Accurate coding within the ICD-10-CM Q73 group supports proper claim adjudication, complete clinical documentation, and appropriate reimbursement.

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    ICD-10-CM Q73: Reduction Defects Of Unspecified Limb Overview

    This group covers congenital reduction defects affecting an unspecified limb, including partial or complete absence of limb segments present at birth. These conditions involve the musculoskeletal system and may affect function, mobility, and prosthetic planning. Accurate coding is important for complete clinical documentation and supports appropriate reimbursement and care coordination.

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    When to Use

    Use codes from this group when documenting congenital limb reduction defects that are not specified to a particular limb segment or when laterality is not documented. These codes apply in clinical records, birth defect registries, and billing when the presentation is a congenital reduction anomaly without a more specific ICD-10-CM code.

    ICD-10-CM Codes

    3 rows

    ICD-10-CM CodeDescription
    Q73.0Congenital absence of unspecified limb(s)
    Q73.1Phocomelia, unspecified limb(s)
    Q73.8Other reduction defects of unspecified limb(s)

    DRG Codes

    3 rows

    DRG CodeDescription
    564Other Musculoskeletal System and Connective Tissue Diagnoses with MCC
    565Other Musculoskeletal System and Connective Tissue Diagnoses with CC
    566Other Musculoskeletal System and Connective Tissue Diagnoses without CC/MCC

    Typical Clinical Scenarios

    • A newborn delivered at term is noted on initial newborn exam to have an absence of the right forearm distal to the elbow with a shortened humerus and malformed hand elements; parents report no prenatal interventions and the infant is referred to orthopedics and genetics for evaluation and prosthetic planning. A congenital longitudinal reduction defect of the upper limb is documented as the primary musculoskeletal finding and used to describe the congenital absence/underdevelopment on the newborn problem list. Typical codes: Q73.0, Q73.8
    • A 6-year-old child with a history of congenital transverse reduction of the lower limb presents to pediatric orthopedics for growth assessment and gait difficulty related to a short residual limb; ongoing limb-length discrepancy management and socket fitting are being coordinated. The chronic congenital reduction defect is the underlying diagnosis driving long-term orthopedic and prosthetic care and is recorded for outpatient management and therapy planning. Typical codes: Q73.1, Q73.8
    • An adult patient with a previously documented congenital reduction deformity of the upper limb presents to the emergency department after a fall onto the residual limb causing skin breakdown and a deep soft tissue infection requiring debridement and antibiotics. The congenital reduction defect is listed to indicate the anatomic abnormality contributing to the acute complication and to guide surgical and wound management decisions. Typical codes: Q73.0, Q73.8

    Related Codes

    Q65-CONGENITAL-DEFORMITIES-OF-HIP

    ICD-10-CM Code For Congenital Deformities Of Hip: Group Overview

    Q66-CONGENITAL-DEFORMITIES-OF-FEET

    ICD-10-CM Code For Congenital Deformities Of Feet: Group Overview

    Q67-CONGENITAL-MUSCULOSKELETAL-DEFORMITIES-HEAD-FACE-SPINE-CHEST

    ICD-10-CM Code For Congenital Musculoskeletal Deformities Of Head Face Spine And Chest: Group Overview

    Q68-OTHER-CONGENITAL-MUSCULOSKELETAL-DEFORMITIES

    ICD-10-CM Code For Other Congenital Musculoskeletal Deformities: Group Overview

    Q69-POLYDACTYLY

    ICD-10-CM Code For Polydactyly: Group Overview

    Q70-SYNDACTYLY-CONGENITAL-DIGIT-FUSION

    ICD-10-CM Code For Syndactyly: Group Overview

    Q71-REDUCTION-DEFECTS-OF-UPPER-LIMB

    ICD-10-CM Code For Reduction Defects Of Upper Limb: Group Overview

    Q72-REDUCTION-DEFECTS-OF-LOWER-LIMB

    ICD-10-CM Code For Reduction Defects Of Lower Limb: Group Overview

    Q74-OTHER-CONGENITAL-MALFORMATIONS-OF-LIMBS

    ICD-10-CM Code For Other Congenital Malformations Of Limb(S): Group Overview

    Q75-OTHER-CONGENITAL-SKULL-FACE-MALFORMATIONS

    ICD-10-CM Code For Other Congenital Malformations Of Skull And Face Bones: Group Overview

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    Frequently Asked Questions

    References

    1. 1.CPT® Codes and Descriptions. AAPC. Retrieved Aug 11, 2026.Maintains the CPT code set's official descriptions and guidelines, licensed from the American Medical Association, used as the definitional source for CPT codes on this page.
    2. 2.HCPCS Quarterly Update. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's quarterly release of HCPCS Level II codes and short/long descriptors, the source for HCPCS code definitions and update history.
    3. 3.ICD-10-CM Full Code List. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's complete ICD-10-CM diagnosis code list, used to cross-reference diagnosis codes associated with this procedure or service.
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