G97.64 ICD-10-CM Code: Postprocedural seroma of a nervous system organ or structure following other procedure

Coding instructions

Official Tabular Instructional Notes: the inclusion, exclusion and sequencing notes published for G97.64 in the official ICD-10-CM tabular list, quoted as published.

Notes without a marker are published on G97.64 itself; “inherited from” names the category or block whose note applies here.

Coder workflow for G97.64

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 G97.64(1 note)

  Coding workflow: The conditions named in this note are not included in G97.64. When the record documents both, both may be reported; the note is a boundary, not a prohibition.

  CompareI97.81, I97.82

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

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.

Indexed Clinical Terms (1)

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.

• Complication (s) (from) (of), postprocedural, seroma (of), nervous system, following other procedure

Don’t confuse G97.64 with…

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

The codes most likely to be picked instead of G97.64 — 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.

• I97.81— 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 intraoperative and postprocedural cerebrovascular infarction adds I97.81; it is not part of this code and both may be reported when both are documented.

  Full comparison: G97.64 vs I97.81 →

• I97.82— 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 intraoperative and postprocedural cerebrovascular infarction adds I97.82; it is not part of this code and both may be reported when both are documented.

  Full comparison: G97.64 vs I97.82 →

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.

Verify Before Coding

• CC as a secondary diagnosis (FY2026). 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 structured relationships — computed from published CMS and AHRQ datasets

MS-DRG Grouper Relationships (FY2026)

Potential MS-DRG participation — not a DRG assignment.

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 74 clinically related codes on its CMS exclusion list.

Named in the grouper logic of 3 MS-DRGs: DRG 919 (MDC 21), DRG 920 (MDC 21), DRG 921 (MDC 21).

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

Clinical classification (AHRQ CCSR):NVS021 — Postprocedural or postoperative nervous system complication (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 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.

G97.51 — Postprocedural hemorrhage of a nervous system organ or structure following a nervous system procedure, G97.52 — Postprocedural hemorrhage of a nervous system organ or structure following other procedure, G97.61 — Postprocedural hematoma of a nervous system organ or structure following a nervous system procedure, G97.62 — Postprocedural hematoma of a nervous system organ or structure following other procedure, G97.63 — Postprocedural seroma of a nervous system organ or structure following a nervous system procedure, 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, I85.01 — Esophageal varices with bleeding, I85.11 — Secondary esophageal varices with bleeding, I97.3 — Postprocedural hypertension, K21.9 — Gastro-esophageal reflux disease without esophagitis, K25.0 — Acute gastric ulcer with hemorrhage, K25.2 — Acute gastric ulcer with both hemorrhage and perforation, K25.4 — Chronic or unspecified gastric ulcer with hemorrhage, K25.6 — Chronic or unspecified gastric ulcer with both hemorrhage and perforation, K26.0 — Acute duodenal ulcer with hemorrhage, +53 more

Same clinical category (CCSR)

AHRQ's Clinical Classifications Software groups these diagnoses under the same clinical category (Postprocedural or postoperative nervous system complication).

G97.0 — Cerebrospinal fluid leak from spinal puncture, G97.1 — Other reaction to spinal and lumbar puncture, G97.2 — Intracranial hypotension following ventricular shunting, G97.31 — Intraoperative hemorrhage and hematoma of a nervous system organ or structure complicating a nervous system procedure, G97.32 — Intraoperative hemorrhage and hematoma of a nervous system organ or structure complicating other procedure, G97.41 — Accidental puncture or laceration of dura during a procedure, G97.48 — Accidental puncture and laceration of other nervous system organ or structure during a nervous system procedure, G97.49 — Accidental puncture and laceration of other nervous system organ or structure during other procedure, G97.51 — Postprocedural hemorrhage of a nervous system organ or structure following a nervous system procedure, G97.52 — Postprocedural hemorrhage of a nervous system organ or structure following other procedure, G97.61 — Postprocedural hematoma of a nervous system organ or structure following a nervous system procedure, G97.62 — Postprocedural hematoma of a nervous system organ or structure following other procedure, G97.63 — Postprocedural seroma of a nervous system organ or structure following a nervous system procedure, G97.81 — Other intraoperative complications of nervous system, G97.82 — Other postprocedural complications and disorders of nervous system, G97.83 — Intracranial hypotension following lumbar cerebrospinal fluid shunting, G97.84 — Intracranial hypotension following other procedure

Contextual Map

Every relationship of G97.64 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

• G00-G99 — Chapter 6: Diseases of the Nervous System (G00-G99) (G00-G99)[Hierarchy]— CMS ICD-10-CM tabular structure · icd10cm-fy2026

Clinical classification (CCSR)

• NVS021 — Postprocedural or postoperative nervous system complication[CCSR]— AHRQ CCSR for ICD-10-CM Diagnoses (HCUP)

MS-DRG Grouper

• CC — Complication or Comorbidity [MS-DRG severity]: “As a secondary diagnosis this code can raise the stay's MS-DRG severity tier (CC).”— CMS MS-DRG Definitions Manual (Appendix C) · FY2026
• DRG 919 — COMPLICATIONS OF TREATMENT WITH MCC[MS-DRG]: “COMPLICATIONS OF TREATMENT WITH MCC (MDC 21)”— CMS MS-DRG Definitions Manual (Appendix B) · FY2026
• DRG 920 — COMPLICATIONS OF TREATMENT WITH CC[MS-DRG]: “COMPLICATIONS OF TREATMENT WITH CC (MDC 21)”— CMS MS-DRG Definitions Manual (Appendix B) · FY2026
• DRG 921 — COMPLICATIONS OF TREATMENT WITHOUT CC/MCC[MS-DRG]: “COMPLICATIONS OF TREATMENT WITHOUT CC/MCC (MDC 21)”— CMS MS-DRG Definitions Manual (Appendix B) · FY2026

MDC crossing

• MDC 21 — Injuries, Poisonings and Toxic Effects of Drugs[MDC crossing]: “Injuries, Poisonings and Toxic Effects of Drugs — 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. 32,029 same-MDC procedures group here; browse them on the MDC page.”— CMS MS-DRG Definitions Manual · FY2026

Index entries

• Complication (s) (from) (of), postprocedural, seroma (of), nervous system, following other procedure[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2026

Nearest codes (23)

• G97 — Intraoperative and postprocedural complications and disorders of nervous system, not elsewhere classified[Sibling]— CMS ICD-10-CM tabular structure · icd10cm-fy2026
• G97.0 — Cerebrospinal fluid leak from spinal puncture[Sibling]— CMS ICD-10-CM tabular structure · icd10cm-fy2026
• G97.1 — Other reaction to spinal and lumbar puncture[Sibling]— CMS ICD-10-CM tabular structure · icd10cm-fy2026
• G97.2 — Intracranial hypotension following ventricular shunting[Sibling]— CMS ICD-10-CM tabular structure · icd10cm-fy2026
• G97.3 — Intraoperative hemorrhage and hematoma of a nervous system organ or structure complicating a procedure[Sibling]— CMS ICD-10-CM tabular structure · icd10cm-fy2026
• G97.31 — Intraoperative hemorrhage and hematoma of a nervous system organ or structure complicating a nervous system procedure[Sibling]— CMS ICD-10-CM tabular structure · icd10cm-fy2026
• G97.32 — Intraoperative hemorrhage and hematoma of a nervous system organ or structure complicating other procedure[Sibling]— CMS ICD-10-CM tabular structure · icd10cm-fy2026
• G97.4 — Accidental puncture and laceration of a nervous system organ or structure during a procedure[Sibling]— CMS ICD-10-CM tabular structure · icd10cm-fy2026
• and 15 more

Change history

• FY2017 — Added to the code set[Change history]— CMS release files (code change ledger) · icd10cm-fy2017

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

Nearest Codes in This Family

Official ICD-10-CM classifications closest to G97.64 in its code family, with their registry titles.

• G97.52 — Postprocedural hemorrhage of a nervous system organ or structure following other procedure
• G97.6 — Postprocedural hematoma and seroma of a nervous system organ or structure following a procedure
• G97.61 — Postprocedural hematoma of a nervous system organ or structure following a nervous system procedure
• G97.62 — Postprocedural hematoma of a nervous system organ or structure following other procedure
• G97.63 — Postprocedural seroma of a nervous system organ or structure following a nervous system procedure
• G97.8 — Other intraoperative and postprocedural complications and disorders of nervous system
• G97.81 — Other intraoperative complications of nervous system
• G97.82 — Other postprocedural complications and disorders of nervous system
• G97.83 — Intracranial hypotension following lumbar cerebrospinal fluid shunting
• G97.84 — Intracranial hypotension following other procedure

View all codes in the G97 family