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ICD-10/Q66.219

Q66.219 ICD-10-CM Code: Congenital metatarsus primus varus, unspecified foot

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

Inpatient Payment Groups (MS-DRG)

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.

Official Registry Overview & Definition

Congenital metatarsus primus varus, unspecified foot is a billable ICD-10-CM diagnosis code (Q66.219).

Official Tabular Instructional Notes

Sequencing, inclusion, and exclusion notes published for Q66.219 in the official ICD-10-CM tabular list.

Excludes1 — Not Coded Here

Conditions generally not reported together with this code (Excludes1) -- an error unless the two conditions are documented as unrelated to each other (ICD-10-CM Official Guidelines, Section I.A.12.a).

Change history

  • FY2020 — 2019-10-01
    Added to the code set
    Congenital metatarsus primus varus, unspecified foot
    FY2020 changes

Verify Before Coding

  • Billable — reportable as written.

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

Contextual Map

Every relationship of Q66.219 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

  • Q66.21 — Congenital metatarsus primus varus [Hierarchy]

Referenced by Excludes1 notes

  • M20 — Acquired deformities of fingers and toes [Excludes1](via Q66.-): “congenital deformities and malformations of fingers and toes (Q66.-, Q68-Q70, Q74.-)”

Clinical classification (CCSR)

  • MAL008 — Musculoskeletal congenital conditions [CCSR]

Potential MS-DRG

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

Nearest codes (40)

  • Q66 — Congenital deformities of feet [Sibling]
  • Q66.0 — Congenital talipes equinovarus [Sibling]
  • Q66.00 — Congenital talipes equinovarus, unspecified foot [Sibling]
  • Q66.01 — Congenital talipes equinovarus, right foot [Sibling]
  • Q66.02 — Congenital talipes equinovarus, left foot [Sibling]
  • Q66.1 — Congenital talipes calcaneovarus [Sibling]
  • Q66.10 — Congenital talipes calcaneovarus, unspecified foot [Sibling]
  • Q66.11 — Congenital talipes calcaneovarus, right foot [Sibling]
  • and 32 more

Change history

  • FY2020 — Added to the code set [Change history]

Referenced by Other Codes

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.

Potential MS-DRG Relationships (FY2026)

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

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.

Official ICD-10-CM tabular notes on other codes that name Q66.219 or its code family.

1 Excludes1 notes: M20 (via Q66.-).

Nearest Codes in This Family

Official ICD-10-CM classifications closest to Q66.219 in its code family, with their registry titles.

  • Q66.12 — Congenital talipes calcaneovarus, left foot
  • Q66.2 — Congenital metatarsus (primus) varus
  • Q66.21 — Congenital metatarsus primus varus
  • Q66.211 — Congenital metatarsus primus varus, right foot
  • Q66.212 — Congenital metatarsus primus varus, left foot
  • Q66.22 — Congenital metatarsus adductus
  • Q66.221 — Congenital metatarsus adductus, right foot
  • Q66.222 — Congenital metatarsus adductus, left foot
  • Q66.229 — Congenital metatarsus adductus, unspecified foot
  • Q66.3 — Other congenital varus deformities of feet

View all codes in the Q66 family