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I35.1 ICD-10-CM Code: Nonrheumatic aortic (valve) insufficiency

Compare with another codeCheck this code on a claim

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

Coding at a Glance

Tabular directives
2 inclusion terms · 4 Excludes2 · 1 code-also instruction

Billable · FY2027A valid, specific ICD-10-CM code, reportable for dates of service in FY2027.

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.

Code alsoMay be needed with this code
  • , if applicable, bicuspid aortic valve (Q23.81)
Excludes2Not included here; may be reported together
  • aortic valve disorder of unspecified cause but with diseases of mitral and/or tricuspid valve(s) (I08.-)
  • aortic valve disorder specified as congenital (Q23.0, Q23.1)
  • aortic valve disorder specified as rheumatic (I06.-)
  • hypertrophic subaortic stenosis (I42.1)
IncludesWhat this code covers
  • Nonrheumatic aortic (valve) incompetence NOS
  • Nonrheumatic aortic (valve) regurgitation NOS

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

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 v44, Appendix B.

  • MS-DRG 306 — CARDIAC CONGENITAL AND VALVULAR DISORDERS WITH MCC (MDC 05)
  • MS-DRG 307 — CARDIAC CONGENITAL AND VALVULAR DISORDERS WITHOUT MCC (MDC 05)

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.

Coding instructions

Official Tabular Instructional Notes: the inclusion, exclusion and sequencing notes published for I35.1 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 I35.1 itself; “inherited from” names the category or block whose note applies here.

Inclusion Terms

Alternative terms the tabular list files under this code.

  • Nonrheumatic aortic (valve) incompetence NOS
  • Nonrheumatic aortic (valve) regurgitation NOS

Excludes2 — Not Included Here

Conditions not covered by this code, but which may be reported alongside it when both are present.

Source: inherited from I35

Code Also

Additional codes that may be required to fully describe the encounter.

  • Code also, if applicable, bicuspid aortic valve (Q23.81)

Source: inherited from I35

Coder workflow for I35.1

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

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

  • Excludes2 — not part of I35.1(4 notes)

    Coding workflow: The conditions named in this note are not included in I35.1. When the record documents both, both may be reported; the note is a boundary, not a prohibition.

    CompareI08, Q23.0, Q23.1, I06, I42.1

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

  • Code Also — related condition(1 note)

    Coding workflow: Review the related condition when both are documented and the instruction applies. A Code Also note does not fix sequencing; the order follows the circumstances of the encounter.

    ReviewQ23.81

    See the official tabular notes · Guidelines I.A.17

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 I35.1 with…

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

The codes most likely to be picked instead of I35.1 — 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.

  • I35.9— 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 “Nonrheumatic aortic valve disorder, unspecified” takes I35.9; specificity in the record moves it back here.

    Full comparison: I35.1 vs I35.9 →

  • I08— Excludes2 relationship (Informational)

    Distinct conditions — both may be reported.

    A distinct condition — both may be reported when both are documented.

    What moves you there: Documentation of aortic valve disorder of unspecified cause but with diseases of mitral and/or tricuspid valve(s) adds I08; it is not part of this code and both may be reported when both are documented.

    Full comparison: I35.1 vs I08 →

  • Q23.0— Excludes2 relationship (Informational)

    Distinct conditions — both may be reported.

    A distinct condition — both may be reported when both are documented.

    What moves you there: Documentation of aortic valve disorder specified as congenital adds Q23.0; it is not part of this code and both may be reported when both are documented.

    Full comparison: I35.1 vs Q23.0 →

  • Q23.1— Excludes2 relationship (Informational)

    Distinct conditions — both may be reported.

    A distinct condition — both may be reported when both are documented.

    What moves you there: Documentation of aortic valve disorder specified as congenital adds Q23.1; it is not part of this code and both may be reported when both are documented.

    Full comparison: I35.1 vs Q23.1 →

  • I06— Excludes2 relationship (Informational)

    Distinct conditions — both may be reported.

    A distinct condition — both may be reported when both are documented.

    What moves you there: Documentation of aortic valve disorder specified as rheumatic adds I06; it is not part of this code and both may be reported when both are documented.

    Full comparison: I35.1 vs I06 →

  • I42.1— Excludes2 relationship (Informational)

    Distinct conditions — both may be reported.

    A distinct condition — both may be reported when both are documented.

    What moves you there: Documentation of hypertrophic subaortic stenosis adds I42.1; it is not part of this code and both may be reported when both are documented.

    Full comparison: I35.1 vs I42.1 →

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

Nonrheumatic aortic (valve) insufficiency is a billable ICD-10-CM diagnosis code (I35.1).

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

  • 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

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

Other codes that name I35.1 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 2 Excludes2 notes: I06 — Rheumatic aortic valve diseases (via I35.-), I08 — Multiple valve diseases (via I35.-).

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

Referenced by 1 Code First instruction: I5A — Non-ischemic myocardial injury (non-traumatic) (via I35.-).

Each of these codes carries a Code First note naming this condition — when that code is reported, THIS code is sequenced first, ahead of it.

Referenced by 1 Code Also instruction: Q23.81 — Bicuspid aortic valve.

These codes suggest coding this condition alongside when both are present.

MS-DRG Grouper Relationships (FY2027)

Potential MS-DRG participation — not a DRG assignment.

FY2027 MS-DRG: not on the CMS CC/MCC list — as a secondary diagnosis this code does not change MS-DRG severity for that release.

Named in the grouper logic of 2 MS-DRGs: DRG 306 (MDC 05), DRG 307 (MDC 05).

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

Clinical classification (AHRQ CCSR):CIR003 — Nonrheumatic and unspecified valve disorders (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 (Nonrheumatic and unspecified valve disorders).

I34.0 — Nonrheumatic mitral (valve) insufficiency, I34.1 — Nonrheumatic mitral (valve) prolapse, I34.2 — Nonrheumatic mitral (valve) stenosis, I34.8 — Other nonrheumatic mitral valve disorders, I34.81 — Nonrheumatic mitral (valve) annulus calcification, I34.89 — Other nonrheumatic mitral valve disorders, I34.9 — Nonrheumatic mitral valve disorder, unspecified, I35.0 — Nonrheumatic aortic (valve) stenosis, I35.2 — Nonrheumatic aortic (valve) stenosis with insufficiency, I35.8 — Other nonrheumatic aortic valve disorders, I35.9 — Nonrheumatic aortic valve disorder, unspecified, I36.0 — Nonrheumatic tricuspid (valve) stenosis, I36.1 — Nonrheumatic tricuspid (valve) insufficiency, I36.2 — Nonrheumatic tricuspid (valve) stenosis with insufficiency, I36.8 — Other nonrheumatic tricuspid valve disorders, I36.9 — Nonrheumatic tricuspid valve disorder, unspecified, I37.0 — Nonrheumatic pulmonary valve stenosis, I37.1 — Nonrheumatic pulmonary valve insufficiency, I37.2 — Nonrheumatic pulmonary valve stenosis with insufficiency, I37.8 — Other nonrheumatic pulmonary valve disorders, +4 more

Same Index main term, other category

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

I08.1 — Rheumatic disorders of both mitral and tricuspid valves (mitral, with, tricuspiddisease), I08.2 — Rheumatic disorders of both aortic and tricuspid valves (aortic, with, tricuspiddisease), I08.3 — Combined rheumatic disorders of mitral, aortic and tricuspid valves (mitral, with, tricuspiddisease, with aorticdisease), I08.8 — Other rheumatic multiple valve diseases (pulmonary, valve, rheumatic, with aortic, mitral or tricuspiddisease), I09.0 — Rheumatic myocarditis (myocardial, myocardium, rheumatic), I09.89 — Other specified rheumatic heart diseases (pulmonary, valve, rheumatic), I13.2 — Hypertensive heart and chronic kidney disease with heart failure and with stage 5 chronic kidney disease, or end stage renal disease (cardiorenal, hypertensive), I24.89 — Other forms of acute ischemic heart disease (coronary), I25.89 — Other forms of chronic ischemic heart disease (coronary, chronic or with a stated duration of over 4 weeks), I34.0 — Nonrheumatic mitral (valve) insufficiency (mitral), I36.1 — Nonrheumatic tricuspid (valve) insufficiency (tricuspid, nonrheumatic), I36.2 — Nonrheumatic tricuspid (valve) stenosis with insufficiency (tricuspid, nonrheumatic, with stenosis), I37.1 — Nonrheumatic pulmonary valve insufficiency (Graham Steell), I37.2 — Nonrheumatic pulmonary valve stenosis with insufficiency (pulmonary, valve, with stenosis), I37.8 — Other nonrheumatic pulmonary valve disorders (pulmonic), I38 — Endocarditis, valve unspecified (valve, valvular), I50.9 — Heart failure, unspecified (myocardial, myocardium), I67.81 — Acute cerebrovascular insufficiency (cerebrovascular), I73.9 — Peripheral vascular disease, unspecified (peripheral vascular), I77.1 — Stricture of artery (arterial), +79 more

Lab tests where this diagnosis supports Medicare coverage (NCD)

Medicare's National Coverage Determination (NCD) program lists this diagnosis as medical justification for these lab tests.

Prothrombin Time Test and INR (PT/INR)

Contextual Map

Every relationship of I35.1 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 I35.1 with these 4 related codes in Claim Check

Hierarchy

Referenced by Excludes2 notes

  • I06 — Rheumatic aortic valve diseases[Excludes2](via I35.-): “aortic valve disease not specified as rheumatic (I35.-)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2027
  • I08 — Multiple valve diseases[Excludes2](via I35.-): “multiple valve disease specified as nonrheumatic (I34.-, I35.-, I36.-, I37.-, I38.-, Q22.-, Q23.-, Q24.8-)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2027

Referenced by Code First instructions

Referenced by Code Also instructions

  • Q23.81 — Bicuspid aortic valve[Code Also]: “aortic (valve) insufficiency (nonrheumatic) (I35.1)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2027

Clinical classification (CCSR)

MS-DRG Grouper

MDC crossing

  • MDC 05 — Diseases and Disorders of the Circulatory System[MDC crossing]: “Diseases and Disorders of the Circulatory System — the grouper's crossing between diagnoses and procedures: a principal diagnosis sets the MDC, and same-MDC procedures move the stay to its surgical DRGs. 15,708 same-MDC procedures group here; browse them on the MDC page.”— CMS MS-DRG Definitions Manual · FY2027

Index entries

  • Austin Flint murmur (aortic insufficiency)[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2027
  • Flint murmur (aortic insufficiency)[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2027
  • Insufficiency, insufficient, aortic (valve)[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2027
  • Insufficiency, insufficient, aortic (valve), specified cause NEC[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2027
  • Murmur (cardiac) (heart) (organic), Flint[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2027

Nearest codes

Change history

  • FY2016 — In the code set at ICD-10-CM adoption [Change history]— CMS release files (code change ledger) · icd10cm-fy2016

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.

Indexed Clinical Terms (5)

Official source data — entries quoted as published, in the Index’s own lookup phrasing

Clinical term phrases from the official ICD-10-CM Index to Diseases and Injuries that map to this code. These are alphabetic-index entries shown as the Index writes them — lookup phrasing, not necessarily the wording of a final diagnosis.

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
Inpatient payment groups Official source data
CMS MS-DRG Definitions Manual (incl. Appendix B diagnosis index, Appendix C CC/MCC list, Appendix E procedure index) and IPPS Final Rule tables — v44 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. "I35.1 — Nonrheumatic aortic (valve) insufficiency." ICD-10-CM FY2027. https://medcoder.ai/icd10/code/i35.1-nonrheumatic-aortic-valve-insufficiency

Change history

  • FY2016 — October 1, 2015
    In the code set at ICD-10-CM adoption
    Nonrheumatic aortic (valve) insufficiency

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

Nearest Codes in This Family

Official ICD-10-CM classifications closest to I35.1 in its code family, with their registry titles.

View all codes in the I35 family