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Q66.7 ICD-10-CM Code: Congenital pes cavus

Compare with another codeCheck this code on a claim

Billing Status: NO. This is a non-billable ICD-10-CM code: report a more specific billable code beneath it.

Coding at a Glance

Tabular directives
3 Excludes1

Not billable · FY2027A non-billable heading in the tabular list: report a more specific code beneath it.

What you need to know

Source: CMS/NCHS Official ICD-10-CM tabular notes, quoted. From the CMS/NCHS tabular list for the release in force. A note the category or block publishes applies to this code too; the Instructions section marks which is which.

Excludes1Never report with this code
  • reduction defects of feet (Q72.-)
  • valgus deformities (acquired) (M21.0-)
  • varus deformities (acquired) (M21.1-)

Most relevant related codes MedCoder-derived

Read off the official notes above and this code’s own position in the tabular list. Which to report is a documentation question; Compare shows the two side by side.

CompareCheck ClaimView Related Codes

Coding instructions

Official Tabular Instructional Notes: the inclusion, exclusion and sequencing notes published for Q66.7 in the official ICD-10-CM tabular list, quoted as published.

Source: CMS/CDC — ICD-10-CM Tabular ListRelease: FY2027Effective: October 1, 2026

Trace:FY2027 changesChange historyRelease, file and checksum

Notes without a marker are published on Q66.7 itself; “inherited from” names the category or block whose note applies here.

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).

Source: inherited from Q66

Coder workflow for Q66.7

MedCoder structured workflow — derived from this code’s own official record

Before you code Q66.7

  1. Q66.7 is not reportable as written. Select the more specific code beneath it that the documentation supports. Codes are reported to the highest level of specificity the classification provides (Guidelines I.B.2).

    ReviewQ66.70, Q66.71, Q66.72

    See the relationships section · Guide: How to choose an ICD-10-CM code →

  2. Check the Excludes1 note: if the documentation supports a condition named there, do not simply proceed with Q66.7. Excludes1 conditions are not reported together with this code unless the record shows they are unrelated (Guidelines I.A.12.a).

    See the official tabular notes

Choose the right path

  1. Does the documentation support one of the more specific codes beneath Q66.7?
    Yes → Select that code and continue the checks below on its own page.
    No → Q66.7 cannot be reported as written; query for the specificity its subcategory needs.

    ReviewQ66.70, Q66.71, Q66.72

  2. Does the documentation support a condition named in Q66.7’s Excludes1 note?
    Yes → Do not simply proceed: review the excluded code. Both are reported only when the record shows the two conditions are unrelated.
    No → Continue.

    ReviewQ72, M21.0, M21.1

Consider Q66.7. Then confirm the code is valid for the date of service in the Verify section.

Documentation check

The provider’s diagnostic statement
Codes are assigned from the provider’s documented diagnosis, not from clinical criteria, test values or a medication list (Guidelines I.A.19).

Official instructions as workflow

  • Excludes1 — check before selecting Q66.7(3 notes)

    Coding workflow: If the documentation supports a condition named in this note, do not simply proceed with Q66.7: the two are not reported together. The one exception is when the record shows the two conditions are unrelated to each other.

    CompareQ72, M21.0, M21.1

    See the official tabular notes · Guidelines I.A.12.a

Coding decision scenarios

Pattern scenarios for this code’s structure — decision rules, not clinical cases

Documentation: Both the condition Q66.7 describes and a condition named in its Excludes1 note are documented for the same encounter.

Coding question: Can both codes be reported?

Path: Review the Excludes1 note and the excluded code, and look for a provider statement on whether the two conditions are related.

Reason: Excludes1 means the two are not coded together; the exception is when the record shows the conditions are unrelated to each other (Guidelines I.A.12.a).

ReviewQ72, M21.0, M21.1

Every row is derived from this code’s own record — its title, tabular notes, 7th-character family and same-category siblings — with fixed MedCoder wording; nothing is inferred about a patient. The official notes and guideline text are in the sections each row links to, and they control.

Don’t confuse Q66.7 with…

MedCoder analysis — pairs from this code’s official notes, distinctions written by MedCoder

The codes most likely to be picked instead of Q66.7 — named in its own official notes, or sharing its laterality or encounter family — with what separates them and which documentation moves the case. Each links to the full comparison.

  • Q72— Excludes1 conflict (Excludes1 — generally not reported together)

    Not coded here — the tabular list excludes this pair for the same encounter.

    Not reported together with this code, except where the two conditions are documented as unrelated.

    What moves you there: Documentation of reduction defects of feet moves the case to Q72; the two are not reported together unless documented as unrelated.

    Full comparison: Q66.7 vs Q72 →

  • M21.0— Excludes1 conflict (Excludes1 — generally not reported together)

    Not coded here — the tabular list excludes this pair for the same encounter.

    Not reported together with this code, except where the two conditions are documented as unrelated.

    What moves you there: Documentation of valgus deformities (acquired) moves the case to M21.0; the two are not reported together unless documented as unrelated.

    Full comparison: Q66.7 vs M21.0 →

  • M21.1— Excludes1 conflict (Excludes1 — generally not reported together)

    Not coded here — the tabular list excludes this pair for the same encounter.

    Not reported together with this code, except where the two conditions are documented as unrelated.

    What moves you there: Documentation of varus deformities (acquired) moves the case to M21.1; the two are not reported together unless documented as unrelated.

    Full comparison: Q66.7 vs M21.1 →

  • Q66.9— Specificity relationship (Review)

    Overlapping diagnoses in the same category.

    Overlapping codes in the same category — the documentation decides which is the more specific fit.

    What moves you there: A record that documents no more than “Congenital deformity of feet, unspecified” takes Q66.9; specificity in the record moves it back here.

    Full comparison: Q66.7 vs Q66.9 →

Relationships are read from this code's own official notes, its laterality siblings and its encounter family; the wording of each distinction is MedCoder editorial, and the documentation named in each “what moves you there” line is the official note phrase or sibling title itself. Source: CMS ICD-10-CM tabular instructional notes; ICD-10-CM Official Guidelines, Section I.A.12.a.

Coding context

Guidelines, coding notes, decision aids, relationships (with MS-DRG and CCSR classification), hierarchy, HCC, coverage and the context map: what a coder reaches for after the core. Each section names whether it is official source data, a MedCoder-derived relationship or MedCoder editorial.

Code Overview

Congenital pes cavus is a non-billable ICD-10-CM category code (Q66.7). A more specific billable subcode must be selected for claims submission.

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

Verify Before Coding

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

MedCoder-derived relationships — computed from published CMS and AHRQ datasets

Other codes that name Q66.7 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 3 Excludes1 notes: M20 — Acquired deformities of fingers and toes (via Q66.-), M21 — Other acquired deformities of limbs (via Q66.-), M24.3 — Pathological dislocation of joint, not elsewhere classified (via Q66.-).

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 Q66.-).

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

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 clinical category (CCSR)

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

Q66.31 — Other congenital varus deformities of feet, right foot, Q66.32 — Other congenital varus deformities of feet, left foot, Q66.4 — Congenital talipes calcaneovalgus, Q66.40 — Congenital talipes calcaneovalgus, unspecified foot, Q66.41 — Congenital talipes calcaneovalgus, right foot, Q66.42 — Congenital talipes calcaneovalgus, left foot, Q66.50 — Congenital pes planus, unspecified foot, Q66.51 — Congenital pes planus, right foot, Q66.52 — Congenital pes planus, left foot, Q66.6 — Other congenital valgus deformities of feet, Q66.70 — Congenital pes cavus, unspecified foot, Q66.71 — Congenital pes cavus, right foot, Q66.72 — Congenital pes cavus, left foot, Q66.80 — Congenital vertical talus deformity, unspecified foot, Q66.81 — Congenital vertical talus deformity, right foot, Q66.82 — Congenital vertical talus deformity, left foot, Q66.89 — Other specified congenital deformities of feet, Q66.9 — Congenital deformity of feet, unspecified, Q66.90 — Congenital deformity of feet, unspecified, unspecified foot, Q66.91 — Congenital deformity of feet, unspecified, right foot, +245 more

Same Index main term, other category

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

D75.1 — Secondary polycythemia (altitude effects, polycythemia), E64.3 — Sequelae of rickets (planus, rachitic sequelae), E78.00 — Pure hypercholesterolemia, unspecified (cholesterol), E78.1 — Pure hyperglyceridemia (triglycerides), E78.2 — Mixed hyperlipidemia (triglycerides, with high cholesterol), O32.4 — Maternal care for high head at term (head at term), Q38.5 — Congenital malformations of palate, not elsewhere classified (palate, congenital), Q53.13 — Unilateral high scrotal testis (scrotal testis, testes, unilateral), Q53.23 — Bilateral high scrotal testes (scrotal testis, testes, bilateral), Q76.6 — Other congenital malformations of ribs (thoracic rib), Q79.1 — Other congenital malformations of diaphragm (diaphragm), R03.0 — Elevated blood-pressure reading, without diagnosis of hypertension (blood pressure, borderline), R50.9 — Fever, unspecified (temperature), R94.8 — Abnormal results of function studies of other organs and systems (basal metabolic rate), T70.0 — Otitic barotrauma (altitude effects, on, ears), T70.1 — Sinus barotrauma (altitude effects, on, sinuses), T70.20 — Unspecified effects of high altitude (altitude effects), T70.29 — Other effects of high altitude (altitude effects, anoxia), Z63.8 — Other specified problems related to primary support group (expressed emotional level within family), Z72.51 — High risk heterosexual behavior (risk, sexual behavior), +3 more

Contextual Map

Every relationship of Q66.7 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.

Run Q66.7 with these 4 related codes in Claim Check

Hierarchy

Referenced by Excludes1 notes

Referenced by Excludes2 notes

Clinical classification (CCSR)

Nearest codes (40)

Change history (2)

Reference

Index terms and tables, published questions and FAQ, every source behind this page with its release and checksum, the date-of-service check and the complete change history.

Common coding questions

MedCoder editorial

Can Q66.7 be billed directly?

No. Q66.7 (Congenital pes cavus) is a non-billable ICD-10-CM category code. A more specific billable subcode must be selected based on clinical documentation.

Sources for this page

Codes, titles, notes, index terms and mappings on this page are transcribed from the datasets below. Relationships MedCoder computed and text MedCoder wrote are labelled where they appear.

Code, title, tabular notes and index terms Official source data
CMS/CDC ICD-10-CM FY2027 tabular list, index and tables, effective October 1, 2026 Release, file and checksum · Publisher’s page
Claim edits Official source data
CMS Definitions of Medicare Code Edits — v44.0 (October 2026) Release, file and checksum · Publisher’s page
Change history and date-of-service validity Official source data
CMS ICD-10-CM release addenda, ingested release by release into the change ledger Release, file and checksum · Publisher’s page
Comparisons, relationships and the contextual map MedCoder-derived relationship
Computed by MedCoder from the tabular notes and tables above; every derived relationship is marked as derived where it appears
Summary and FAQ answers MedCoder editorial explanation
Written by MedCoder to explain the sources above: drafted with AI assistance, checked by a person against the release files, and labelled as MedCoder text where it appears. Not official text.

Current data releases:ICD-10-CM FY2027 · ICD-10-PCS FY2027 · HCPCS October 2026 · MS-DRG v44 · Medicare Code Editor v44.0 · NCCI PTP Q4 2026 · MUE Q4 2026 · NCD code lists 2026-01 · LCD export September 20, 2026 · All releases and sources

Labels on this page: Official source data · MedCoder-derived relationship · MedCoder editorial explanation. How to read the labels · All data sources and release dates · CMS coding rules

Cite this page

Reference this page in a research guide, syllabus or article. The release is included because code content changes each year.

MedCoder.ai. "Q66.7 — Congenital pes cavus." ICD-10-CM FY2027. https://medcoder.ai/icd10/code/q66.7-congenital-pes-cavus

Change history

  • FY2020 — October 1, 2019
    Became a non-billable header
    FY2020 changes
  • FY2016 — October 1, 2015
    In the code set at ICD-10-CM adoption
    Congenital pes cavus

Nearest Codes in This Family

Official ICD-10-CM classifications closest to Q66.7 in its code family, with their registry titles.

View all codes in the Q66 family