Skip to main content

I35.0 ICD-10-CM Code: Nonrheumatic aortic (valve) stenosis

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

Coding at a Glance

Tabular directives
4 Excludes2 · 1 code-also instruction

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, 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 I35.0 in the official ICD-10-CM tabular list, quoted as published.

Source: CMS/CDC — ICD-10-CM Tabular ListRelease: FY2026Effective: October 1, 2025

Notes without a marker are published on I35.0 itself; “inherited from” names the category or block whose note applies here.

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 I35.0

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 I35.0(4 notes)

    Coding workflow: The conditions named in this note are not included in I35.0. 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.

Code Overview

Nonrheumatic aortic (valve) stenosis is a billable ICD-10-CM diagnosis code (I35.0).

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

Indexed Clinical Terms (2)

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.

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 structured relationships — computed from published CMS and AHRQ datasets

Other codes that name I35.0 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 (FY2026)

Potential MS-DRG participation — not a DRG assignment.

FY2026 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, I35.1 — Nonrheumatic aortic (valve) insufficiency, 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 term “Stenosis, stenotic”; these codes share that main term but sit in a different category of the Tabular List.

I07.0 — Rheumatic tricuspid stenosis (tricuspid), I07.2 — Rheumatic tricuspid stenosis and insufficiency (tricuspid, with, incompetency, insufficiency or regurgitation), I08.0 — Rheumatic disorders of both mitral and aortic valves (mitral, with, aortic valve disease), I08.1 — Rheumatic disorders of both mitral and tricuspid valves (tricuspid, with, mitraldisease), I08.2 — Rheumatic disorders of both aortic and tricuspid valves (tricuspid, with, aorticdisease), I08.3 — Combined rheumatic disorders of mitral, aortic and tricuspid valves (tricuspid, with, mitraldisease, with aorticdisease), I08.8 — Other rheumatic multiple valve diseases (pulmonary, valve, rheumatic, with aortic, mitral or tricuspiddisease), I09.89 — Other specified rheumatic heart diseases (pulmonary, valve, rheumatic), I28.8 — Other diseases of pulmonary vessels (pulmonary, acquired), I34.2 — Nonrheumatic mitral (valve) stenosis (mitral, specified cause, except rheumatic), I36.0 — Nonrheumatic tricuspid (valve) stenosis (tricuspid, nonrheumatic), I36.2 — Nonrheumatic tricuspid (valve) stenosis with insufficiency (tricuspid, nonrheumatic, with insufficiency), I37.0 — Nonrheumatic pulmonary valve stenosis (pulmonary, valve), I37.2 — Nonrheumatic pulmonary valve stenosis with insufficiency (pulmonary, valve, with insufficiency), I38 — Endocarditis, valve unspecified (valve), I42.1 — Obstructive hypertrophic cardiomyopathy (hypertrophic subaortic), I70.0 — Atherosclerosis of aorta (aorta, calcified), I70.1 — Atherosclerosis of renal artery (renal artery), I70.8 — Atherosclerosis of other arteries (artery NEC, celiac, atherosclerosis), I77.1 — Stricture of artery (artery NEC), +168 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 I35.0 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 I35.0 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-fy2026
  • 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-fy2026

Referenced by Code First instructions

Referenced by Code Also instructions

  • Q23.81 — Bicuspid aortic valve[Code Also]: “aortic (valve) stenosis (nonrheumatic) (I35.0)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2026

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. 17,209 same-MDC procedures group here; browse them on the MDC page.”— CMS MS-DRG Definitions Manual · FY2026

Index entries

  • Stenosis, stenotic (cicatricial), aortic (valve)[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2026
  • Stenosis, stenotic (cicatricial), aortic (valve), specified cause NEC[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2026

Nearest codes

Change history

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

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 FY2026 tabular list, index and tables, effective October 1, 2025 Release, file and checksum · Publisher’s page
Claim edits Official source data
CMS Definitions of Medicare Code Edits — v43.1 (April 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 — v43 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 structured 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 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.

Labels on this page: Official source data · MedCoder structured relationship · MedCoder explanation. How to read the labels · All data sources and release dates

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. "I35.0 — Nonrheumatic aortic (valve) stenosis." ICD-10-CM FY2026. https://medcoder.ai/icd10/code/i35.0-nonrheumatic-aortic-valve-stenosis

Change history

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

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.

Nearest Codes in This Family

Official ICD-10-CM classifications closest to I35.0 in its code family, with their registry titles.

View all codes in the I35 family