Skip to main content

I97.821 ICD-10-CM Code: Postprocedural cerebrovascular infarction following other surgery

Compare with another code for I97.821Check 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
1 Excludes2 · 1 use-additional code
Risk adjustment
CMS-HCC V22 category 100

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, and is marked with where it comes from.

Use additional codefrom I97.8Report with this code when documented
  • Use additional code, if applicable, to further specify disorder
Excludes2from I97Not included here; may be reported together
  • postprocedural shock (T81.1-)

Where it sits Source: CMS/NCHS

Under:Chapter 9: Diseases of the Circulatory SystemI95-I99 Other and unspecified disorders of the circulatory systemI97 Intraoperative and postprocedural complications and disorders of circulatory system, not elsewhere classifiedI97.8 Other intraoperative and postprocedural complications and disorders of the circulatory system, not elsewhere classifiedI97.82 Postprocedural cerebrovascular infarction

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 091 — OTHER DISORDERS OF NERVOUS SYSTEM WITH MCC (MDC 01)
  • MS-DRG 092 — OTHER DISORDERS OF NERVOUS SYSTEM WITH CC (MDC 01)
  • MS-DRG 093 — OTHER DISORDERS OF NERVOUS SYSTEM WITHOUT CC/MCC (MDC 01)

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 I97.821 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 I97.821 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 I97

Use Additional Code

Supplementary codes the tabular list directs you to add.

  • Use additional code, if applicable, to further specify disorder

Source: inherited from I97.8

Coder workflow for I97.821

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).
The conditions the Use Additional Code note names
Reported with this code when documented; a conditional instruction (“if applicable”, “if known”) applies only when the record supports it.

Official instructions as workflow

  • Excludes2 — not part of I97.821(1 note)

    Coding workflow: The conditions named in this note are not included in I97.821. When the record documents both, both may be reported; the note is a boundary, not a prohibition.

    CompareT81.1

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

  • Use Additional Code — after identifying I97.821(1 note)

    Coding workflow: Check whether the documentation supports the additional code(s) the note names, and report them with I97.821 when it does. Where the instruction is conditional (“if applicable”, “if known”), it applies only when the record documents the condition.

    See the official tabular notes · Guidelines I.A.13

Coding decision scenarios

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

Documentation: A condition the Use Additional Code note names is documented.

Coding question: Is a second code reported with I97.821?

Path: Review the Use Additional Code note and the code it names.

Reason: The additional code is reported when the record documents the condition; a conditional instruction applies only when its condition is met (Guidelines I.A.13).

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 I97.821 with…

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

The codes most likely to be picked instead of I97.821 — 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.

  • T81.1— 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 postprocedural shock adds T81.1; it is not part of this code and both may be reported when both are documented.

    Full comparison: I97.821 vs T81.1 →

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

Postprocedural cerebrovascular infarction following other surgery is a billable ICD-10-CM diagnosis code (I97.821).

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

  • CC as a secondary diagnosis (FY2027). Can raise the stay's MS-DRG severity tier.

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 I97.821 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 11 Excludes2 notes across 2 chapters: G97 — Intraoperative and postprocedural complications and disorders of nervous system, not elsewhere classified (via I97.82.-), T80 — Complications following infusion, transfusion and therapeutic injection (via I97.-), T80-T88 — Complications of surgical and medical care, not elsewhere classified (T80-T88) (via I97.-), T81 — Complications of procedures, not elsewhere classified (via I97.-), T82 — Complications of cardiac and vascular prosthetic devices, implants and grafts (via I97.-), T83 — Complications of genitourinary prosthetic devices, implants and grafts (via I97.-), T84 — Complications of internal orthopedic prosthetic devices, implants and grafts (via I97.-), T85 — Complications of other internal prosthetic devices, implants and grafts (via I97.-), T86 — Complications of transplanted organs and tissue (via I97.-), T87 — Complications peculiar to reattachment and amputation (via I97.-), T88 — Other complications of surgical and medical care, not elsewhere classified (via I97.-).

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

MS-DRG Grouper Relationships (FY2027)

Potential MS-DRG participation — not a DRG assignment.

FY2027 MS-DRG: CC — Complication or Comorbidity. Reported as a secondary diagnosis, this code raises the stay's MS-DRG severity tier — except when the principal diagnosis is one of 60 clinically related codes on its CMS exclusion list.

Named in the grouper logic of 3 MS-DRGs: DRG 091 (MDC 01), DRG 092 (MDC 01), DRG 093 (MDC 01).

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

Clinical classification (AHRQ CCSR):CIR038 — Postprocedural or postoperative circulatory system complication (default); CIR020 — Cerebral infarction.

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 process (MS-DRG)

Acts as CC — raises the severity of other admissions. CMS groups these diagnoses into one MS-DRG principal-diagnosis exclusion process — a CC/MCC on this list never raises severity when the principal diagnosis is also on it.

H95.811 — Postprocedural stenosis of right external ear canal, H95.812 — Postprocedural stenosis of left external ear canal, H95.813 — Postprocedural stenosis of external ear canal, bilateral, H95.819 — Postprocedural stenosis of unspecified external ear canal, H95.88 — Other intraoperative complications and disorders of the ear and mastoid process, not elsewhere classified, H95.89 — Other postprocedural complications and disorders of the ear and mastoid process, not elsewhere classified, I97.3 — Postprocedural hypertension, I97.810 — Intraoperative cerebrovascular infarction during cardiac surgery, I97.811 — Intraoperative cerebrovascular infarction during other surgery, I97.820 — Postprocedural cerebrovascular infarction following cardiac surgery, L76.81 — Other intraoperative complications of skin and subcutaneous tissue, L76.82 — Other postprocedural complications of skin and subcutaneous tissue, M96.89 — Other intraoperative and postprocedural complications and disorders of the musculoskeletal system, N98.1 — Hyperstimulation of ovaries, N98.2 — Complications of attempted introduction of fertilized ovum following in vitro fertilization, N98.3 — Complications of attempted introduction of embryo in embryo transfer, N98.8 — Other complications associated with artificial fertilization, N98.9 — Complication associated with artificial fertilization, unspecified, T81.82XA — Emphysema (subcutaneous) resulting from a procedure, initial encounter, T81.89XA — Other complications of procedures, not elsewhere classified, initial encounter, +39 more

Same clinical category (CCSR)

AHRQ's Clinical Classifications Software groups these diagnoses under the same clinical categories (Postprocedural or postoperative circulatory system complication, Cerebral infarction).

I97.640 — Postprocedural seroma of a circulatory system organ or structure following a cardiac catheterization, I97.641 — Postprocedural seroma of a circulatory system organ or structure following cardiac bypass, I97.648 — Postprocedural seroma of a circulatory system organ or structure following other circulatory system procedure, I97.710 — Intraoperative cardiac arrest during cardiac surgery, I97.711 — Intraoperative cardiac arrest during other surgery, I97.790 — Other intraoperative cardiac functional disturbances during cardiac surgery, I97.791 — Other intraoperative cardiac functional disturbances during other surgery, I97.810 — Intraoperative cerebrovascular infarction during cardiac surgery, I97.811 — Intraoperative cerebrovascular infarction during other surgery, I97.820 — Postprocedural cerebrovascular infarction following cardiac surgery, I97.88 — Other intraoperative complications of the circulatory system, not elsewhere classified, I97.89 — Other postprocedural complications and disorders of the circulatory system, not elsewhere classified, R29.700 — NIHSS score 0, R29.701 — NIHSS score 1, R29.702 — NIHSS score 2, R29.703 — NIHSS score 3, R29.704 — NIHSS score 4, R29.705 — NIHSS score 5, R29.706 — NIHSS score 6, R29.707 — NIHSS score 7, +164 more

Same Index main term, other category

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

I63.2 — Cerebral infarction due to unspecified occlusion or stenosis of precerebral arteries (cerebral, due to, stenosis NEC, precerebral arteries), I63.3 — Cerebral infarction due to thrombosis of cerebral arteries (cerebral, due to, thrombosis, cerebral artery), I63.4 — Cerebral infarction due to embolism of cerebral arteries (cerebral, due to, embolism, cerebral arteries), I63.5 — Cerebral infarction due to unspecified occlusion or stenosis of cerebral arteries (cerebral, due to, stenosis NEC, cerebral arteries), I63.6 — Cerebral infarction due to cerebral venous thrombosis, nonpyogenic (cerebral, due to, cerebral venous thrombosis, nonpyogenic), I63.81 — Other cerebral infarction due to occlusion or stenosis of small artery (lacunar), I63.89 — Other cerebral infarction (cerebral, specified NEC), I63.9 — Cerebral infarction, unspecified, I74.8 — Embolism and thrombosis of other arteries (spleen, embolic or thrombotic), I89.8 — Other specified noninfective disorders of lymphatic vessels and lymph nodes (lymph node), K55.021 — Focal (segmental) acute infarction of small intestine (intestine, small, focal), K55.022 — Diffuse acute infarction of small intestine (intestine, small, diffuse), K55.029 — Acute infarction of small intestine, extent unspecified (intestine, small), K55.041 — Focal (segmental) acute infarction of large intestine (intestine, large, focal), K55.042 — Diffuse acute infarction of large intestine (intestine, large, diffuse), K55.049 — Acute infarction of large intestine, extent unspecified (colon), K55.061 — Focal (segmental) acute infarction of intestine, part unspecified (intestine, focal), K55.062 — Diffuse acute infarction of intestine, part unspecified (intestine, diffuse), K55.069 — Acute infarction of intestine, part and extent unspecified (bowel), K76.3 — Infarction of liver (liver), +51 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.

Partial Thromboplastin Time (PTT) Test, Prothrombin Time Test and INR (PT/INR)

Contextual Map

Every relationship of I97.821 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 I97.821 with these 8 related codes in Claim Check

Hierarchy

Referenced by Excludes2 notes (11)

Clinical classification (CCSR)

MS-DRG Grouper

MDC crossing

  • MDC 01 — Diseases and Disorders of the Nervous System[MDC crossing]: “Diseases and Disorders of the Nervous 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. 8,919 same-MDC procedures group here; browse them on the MDC page.”— CMS MS-DRG Definitions Manual · FY2027

Index entries

  • Infarct, infarction, cerebral (acute), postprocedural, following other surgery[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2027
  • Stroke (apoplectic) (brain) (ischemic) (paralytic), postprocedural, following other surgery[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2027

Nearest codes (40)

Change history (3)

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 (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.

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 28, 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. "I97.821 — Postprocedural cerebrovascular infarction following other surgery." ICD-10-CM FY2027. https://medcoder.ai/icd10/code/i97.821-postprocedural-cerebrovascular-infarction-following-other-surgery

Change history

  • FY2017 — October 1, 2016
    Description revised
    Postprocedural cerebrovascular infarction during other surgery → Postprocedural cerebrovascular infarction following other surgery
    FY2017 changes
  • FY2017 — October 1, 2016
    Short description revised
    Postprocedural cerebrovascular infarction during oth surgery → Postprocedural cerebvasc infarction following other surgery
    FY2017 changes
  • FY2016 — October 1, 2015
    In the code set at ICD-10-CM adoption
    Postprocedural cerebrovascular infarction during other surgery

Nearest Codes in This Family

Official ICD-10-CM classifications closest to I97.821 in its code family, with their registry titles.

View all codes in the I97 family