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Q72.91 ICD-10-CM Code: Unspecified reduction defect of right lower limb

Billing Status: YES. This is a valid, specific, and billable ICD-10-CM reference.

Inpatient Payment Groups (MS-DRG)

Potential MS-DRG participation — not a DRG assignment.

MS-DRGs this diagnosis helps define, as principal or secondary, per the CMS ICD-10-CM/PCS MS-DRG Definitions Manual v43.0, Appendix B.

  • MS-DRG 564 — OTHER MUSCULOSKELETAL SYSTEM AND CONNECTIVE TISSUE DIAGNOSES WITH MCC (MDC 08)
  • MS-DRG 565 — OTHER MUSCULOSKELETAL SYSTEM AND CONNECTIVE TISSUE DIAGNOSES WITH CC (MDC 08)
  • MS-DRG 566 — OTHER MUSCULOSKELETAL SYSTEM AND CONNECTIVE TISSUE DIAGNOSES WITHOUT CC/MCC (MDC 08)

A diagnosis appearing in a group's logic does not by itself determine the DRG assigned to a stay; the grouper uses the full claim.

Code Overview

Unspecified reduction defect of right lower limb is a billable ICD-10-CM diagnosis code (Q72.91).

MedCoder summary Summary composed by MedCoder from this code's official ICD-10-CM record. The tabular instructional notes themselves appear verbatim below.

Change history

  • FY2016 — October 1, 2015
    In the code set at ICD-10-CM adoption
    Unspecified reduction defect of right lower limb

No changes since FY2016 — additions, deletions, description changes and billable-status changes are tracked through FY2027 (effective October 1, 2026), and none are recorded for this code. Note changes are tracked from FY2027 only.

Verify Before Coding

  • No Medicare Code Editor or MS-DRG Definitions Manual restrictions apply to this code.

From the code registry, the Medicare Code Editor, and the MS-DRG Definitions Manual. Check it against a full claim in Claim Check.

Relationships & Classification

Other codes that name Q72.91 or its code family, from the CMS ICD-10-CM tabular instructional notes. Tabular-note edges are stored at the code family level that carries each note.

Referenced by 6 Excludes1 notes across 3 chapters: M21 — Other acquired deformities of limbs (via Q72.-), M24.3 — Pathological dislocation of joint, not elsewhere classified (via Q72.-), Q66 — Congenital deformities of feet (via Q72.-), Q68 — Other congenital musculoskeletal deformities (via Q72.-), Q74 — Other congenital malformations of limb(s) (via Q72.-), Z89 — Acquired absence of limb (via Q72.-).

These codes’ tabular lists mark this diagnosis as mutually exclusive — not reported together unless the conditions are documented as unrelated.

Referenced by 1 Excludes2 note: M95 — Other acquired deformities of musculoskeletal system and connective tissue (via Q72.-).

These codes’ tabular lists name this diagnosis as distinct — both may be reported when both are documented.

MS-DRG Grouper Relationships (FY2026)

Not on the CMS CC/MCC list — as a secondary diagnosis this code does not change MS-DRG severity.

Potential MS-DRG participation — not a DRG assignment.

Named in the grouper logic of 3 MS-DRGs: DRG 564 (MDC 08), DRG 565 (MDC 08), DRG 566 (MDC 08).

From the CMS MS-DRG Definitions Manual (Appendices B and C). Actual DRG assignment depends on the complete claim.

Clinical classification (AHRQ CCSR):MAL008 — Musculoskeletal congenital conditions (default).

Clinical Classifications Software Refined (CCSR) for ICD-10-CM Diagnoses. Healthcare Cost and Utilization Project (HCUP), Agency for Healthcare Research and Quality.

Related Codes

Same condition, opposite side

Same category and title, differing only in which side of the body is affected.

Q72.90 — Unspecified reduction defect of unspecified lower limb (unspecified)Compare Q72.91 vs Q72.90 →, Q72.92 — Unspecified reduction defect of left lower limb (left)Compare Q72.91 vs Q72.92 →

Same clinical category (CCSR)

AHRQ's Clinical Classifications Software groups these diagnoses under the same clinical category (Musculoskeletal congenital conditions).

Q72.73 — Split foot, bilateral, Q72.811 — Congenital shortening of right lower limb, Q72.812 — Congenital shortening of left lower limb, Q72.813 — Congenital shortening of lower limb, bilateral, Q72.819 — Congenital shortening of unspecified lower limb, Q72.891 — Other reduction defects of right lower limb, Q72.892 — Other reduction defects of left lower limb, Q72.893 — Other reduction defects of lower limb, bilateral, Q72.899 — Other reduction defects of unspecified lower limb, Q72.90 — Unspecified reduction defect of unspecified lower limb, Q72.92 — Unspecified reduction defect of left lower limb, Q72.93 — Unspecified reduction defect of lower limb, bilateral, Q73.0 — Congenital absence of unspecified limb(s), Q73.1 — Phocomelia, unspecified limb(s), Q73.8 — Other reduction defects of unspecified limb(s), Q74.0 — Other congenital malformations of upper limb(s), including shoulder girdle, Q74.1 — Congenital malformation of knee, Q74.2 — Other congenital malformations of lower limb(s), including pelvic girdle, Q74.3 — Arthrogryposis multiplex congenita, Q74.8 — Other specified congenital malformations of limb(s), +245 more

Same Index main term, other category

The ICD-10-CM Index to Diseases and Injuries files this code under the main term “Defect, defective”; these codes share that main term but sit in a different category of the Tabular List.

Q62.2 — Congenital megaureter (obstructive, congenital, ureter, megaureter), Q62.31 — Congenital ureterocele, orthotopic (obstructive, congenital, ureter, orthotopic ureterocele), Q62.32 — Cecoureterocele (obstructive, congenital, ureter, cecoureterocele), Q62.39 — Other obstructive defects of renal pelvis and ureter (renal pelvis, obstructive), Q63.8 — Other specified congenital malformations of kidney (renal pelvis), Q71.4 — Longitudinal reduction defect of radius (reduction, limb, upper, longitudinal, radius), Q71.5 — Longitudinal reduction defect of ulna (reduction, limb, upper, longitudinal, ulna), Q71.6 — Lobster-claw hand (reduction, limb, upper, lobster-claw hand), Q71.89 — Other reduction defects of upper limb (reduction, limb, upper, specified type NEC), Q71.9 — Unspecified reduction defect of upper limb (reduction, limb, upper), Q73.8 — Other reduction defects of unspecified limb(s) (reduction, limb), Q79.0 — Congenital diaphragmatic hernia (diaphragm, congenital, gross), Q79.1 — Other congenital malformations of diaphragm (diaphragm, congenital), Q79.59 — Other congenital malformations of abdominal wall (abdominal wall, congenital), Q82.9 — Congenital malformation of skin, unspecified (ectodermal, congenital), Q89.9 — Congenital malformation, unspecified, R47.89 — Other speech disturbances (speech, specified NEC), R49.8 — Other voice and resonance disorders (voice, specified NEC), R49.9 — Unspecified voice and resonance disorder (voice), R93.3 — Abnormal findings on diagnostic imaging of other parts of digestive tract (filling, stomach), +95 more

Contextual Map

Every relationship of Q72.91 in one view: hierarchy, official tabular instructions in both directions, clinical classification, risk adjustment, MS-DRG participation, index terms and change history — each edge carrying the CMS source it derives from.

Hierarchy

Referenced by Excludes1 notes

Referenced by Excludes2 notes

Clinical classification (CCSR)

MS-DRG Grouper

MDC crossing

Nearest codes (40)

Change history

  • FY2016 — In the code set at ICD-10-CM adoption [Change history]

Nearest Codes in This Family

Official ICD-10-CM classifications closest to Q72.91 in its code family, with their registry titles.

View all codes in the Q72 family