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C71.9 ICD-10-CM Code: Malignant neoplasm of brain, unspecified

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

Coding at a Glance

Tabular directives
2 Excludes1
Risk adjustment
CMS-HCC V28: 1 category · CMS-HCC V22 category 10 · RxHCC V08 category 22

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 054 — NERVOUS SYSTEM NEOPLASMS WITH MCC (MDC 01)
  • MS-DRG 055 — NERVOUS SYSTEM NEOPLASMS WITHOUT 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.

Risk Adjustment (CMS-HCC)

Payment categories this diagnosis maps to under CMS-HCC V28, payment year 2026.

  • HCC 20 — Lung and Other Severe Cancers (supersedes HCC 21, HCC 22, HCC 23)

Other models: CMS-HCC V22 HCC 10 · RxHCC V08 HCC 22

Risk scores depend on the enrollee's full accepted diagnosis set and segment; a category mapping alone does not determine payment.

Coding instructions

Official Tabular Instructional Notes: the inclusion, exclusion and sequencing notes published for C71.9 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 C71.9 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 C71

Coder workflow for C71.9

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

Before you code C71.9

  1. Unspecified does not mean incorrect. When the record gives no greater specificity, C71.9 may be the appropriate code. Check the record for detail that supports a more specific sibling. An unspecified code is for records that do not provide the detail a more specific code needs; a query, not an assumption, is the route to specificity (Guidelines I.A.9.b, I.B.18).

    ReviewC71.0, C71.1, C71.2, C71.3, C71.4, C71.5, C71.6, C71.7

    See the relationships section · Guide: Other vs unspecified (NEC vs NOS) →

  2. Confirm the documented site and behavior (this code’s block classifies malignant neoplasms), whether the site is primary or secondary, and whether the malignancy is current or a personal history: a previously excised malignancy with no further treatment and no evidence of disease is history, not current disease. Verify the site against the Table of Neoplasms. Neoplasm chapter guidelines (Guidelines I.C.2.a, I.C.2.d, I.C.2.m).

    See the Table of Neoplasms entries · Guide: Active cancer vs history of cancer →

  3. Check the Excludes1 note: if the documentation supports a condition named there, do not simply proceed with C71.9. 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 record document the detail a more specific sibling code needs?
    Yes → Review the specific siblings in this subcategory.
    No → Continue — C71.9 is appropriate when the documentation goes no further.

    ReviewC71.0, C71.1, C71.2, C71.3, C71.4, C71.5, C71.6, C71.7

  2. Does the documentation support a condition named in C71.9’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.

    ReviewC69.6

Consider C71.9. 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).
Anatomical site
At the most specific level the record states; a site the classification separates cannot be assumed from a procedure or a measurement.
Behavior and current-versus-history status
Malignant, in situ, benign or uncertain; primary or secondary; current disease or personal history (Guidelines I.C.2.m).
Any detail beyond this code’s title
What the record states that a more specific sibling code would capture — or its absence, which itself supports the unspecified code.

Official instructions as workflow

  • Excludes1 — check before selecting C71.9(2 notes)

    Coding workflow: If the documentation supports a condition named in this note, do not simply proceed with C71.9: the two are not reported together. The one exception is when the record shows the two conditions are unrelated to each other.

    CompareC69.6

    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: The provider documents the condition in the terms of this code’s title and records no further detail.

Coding question: Is a more specific sibling code supportable?

Path: Review the specific siblings in this subcategory and what each requires the record to state.

Reason: A more specific code needs documentation of the distinguishing element; without it the unspecified code is appropriate, and a provider query is the route to specificity (Guidelines I.A.9.b, I.B.18).

ReviewC71.0, C71.1, C71.2, C71.3, C71.4, C71.5, C71.6, C71.7

Documentation: Both the condition C71.9 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).

ReviewC69.6

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.

Coding context

The comparisons, hierarchy, index entries, guidelines, relationships, risk-adjustment and coverage context a coder commonly needs. Each section names whether it is official source data, a MedCoder-derived relationship or MedCoder editorial.

Don’t confuse C71.9 with…

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

The codes most likely to be picked instead of C71.9 — 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.

  • C72.2— 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 malignant neoplasm of cranial nerves moves the case to C72.2; the two are not reported together unless documented as unrelated.

    Full comparison: C71.9 vs C72.2 →

  • C72.5— 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 malignant neoplasm of cranial nerves moves the case to C72.5; the two are not reported together unless documented as unrelated.

    Full comparison: C71.9 vs C72.5 →

  • C69.6— 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 retrobulbar malignant neoplasm moves the case to C69.6; the two are not reported together unless documented as unrelated.

    Full comparison: C71.9 vs C69.6 →

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.

Code Overview

Malignant neoplasm of brain, unspecified is a billable ICD-10-CM diagnosis code (C71.9).

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 (30)

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.

Neoplasm Table Sites (10)

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

Anatomical sites from the official ICD-10-CM Table of Neoplasms that map to this code, with the matching behavior column.

  • Neoplasm, neoplastic, brain NEC — Malignant, Primary
  • Neoplasm, neoplastic, cranial (fossa, any) — Malignant, Primary
  • Neoplasm, neoplastic, fossa (of), anterior (cranial) — Malignant, Primary
  • Neoplasm, neoplastic, fossa (of), cranial — Malignant, Primary
  • Neoplasm, neoplastic, fossa (of), middle (cranial) — Malignant, Primary
  • Neoplasm, neoplastic, fossa (of), posterior (cranial) — Malignant, Primary
  • Neoplasm, neoplastic, intracranial NEC — Malignant, Primary
  • Neoplasm, neoplastic, motor tract, brain — Malignant, Primary
  • Neoplasm, neoplastic, posterior fossa (cranial) — Malignant, Primary
  • Neoplasm, neoplastic, suprasellar (region) — Malignant, Primary

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 structured relationships — computed from published CMS and AHRQ datasets

Other codes that name C71.9 or its code family, from the CMS Table of Neoplasms and the CMS Table of Neoplasms (site match derived from the code title).

Referenced by 4 Same-site neoplasm codes: C79.31 — Secondary malignant neoplasm of brainCompare C71.9 vs C79.31 →, D33.2 — Benign neoplasm of brain, unspecifiedCompare C71.9 vs D33.2 →, D43.2 — Neoplasm of uncertain behavior of brain, unspecifiedCompare C71.9 vs D43.2 →, D49.6 — Neoplasm of unspecified behavior of brainCompare C71.9 vs D49.6 →.

These codes represent related neoplasm behaviors affecting the same anatomic site.

Referenced by 1 Screening & history code: Z85.841 — Personal history of malignant neoplasm of brainCompare C71.9 vs Z85.841 →.

These codes represent screening tests and history codes that refer to this active disease condition.

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 40 clinically related codes on its CMS exclusion list.

Named in the grouper logic of 2 MS-DRGs: DRG 054 (MDC 01), DRG 055 (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):NEO048 — Nervous system cancers - brain (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.

C70.9 — Malignant neoplasm of meninges, unspecified, C71.0 — Malignant neoplasm of cerebrum, except lobes and ventricles, C71.1 — Malignant neoplasm of frontal lobe, C71.2 — Malignant neoplasm of temporal lobe, C71.3 — Malignant neoplasm of parietal lobe, C71.4 — Malignant neoplasm of occipital lobe, C71.5 — Malignant neoplasm of cerebral ventricle, C71.6 — Malignant neoplasm of cerebellum, C71.7 — Malignant neoplasm of brain stem, C71.8 — Malignant neoplasm of overlapping sites of brain, C72.20 — Malignant neoplasm of unspecified olfactory nerve, C72.21 — Malignant neoplasm of right olfactory nerve, C72.22 — Malignant neoplasm of left olfactory nerve, C72.30 — Malignant neoplasm of unspecified optic nerve, C72.31 — Malignant neoplasm of right optic nerve, C72.32 — Malignant neoplasm of left optic nerve, C72.40 — Malignant neoplasm of unspecified acoustic nerve, C72.41 — Malignant neoplasm of right acoustic nerve, C72.42 — Malignant neoplasm of left acoustic nerve, C72.50 — Malignant neoplasm of unspecified cranial nerve, +19 more

Same CMS-HCC risk category (V28)

CMS maps these diagnoses to the same Hierarchical Condition Category (Lung and Other Severe Cancers) for risk-adjusted payment.

C70.9 — Malignant neoplasm of meninges, unspecified, C71.0 — Malignant neoplasm of cerebrum, except lobes and ventricles, C71.1 — Malignant neoplasm of frontal lobe, C71.2 — Malignant neoplasm of temporal lobe, C71.3 — Malignant neoplasm of parietal lobe, C71.4 — Malignant neoplasm of occipital lobe, C71.5 — Malignant neoplasm of cerebral ventricle, C71.6 — Malignant neoplasm of cerebellum, C71.7 — Malignant neoplasm of brain stem, C71.8 — Malignant neoplasm of overlapping sites of brain, C72.0 — Malignant neoplasm of spinal cord, C72.1 — Malignant neoplasm of cauda equina, C72.20 — Malignant neoplasm of unspecified olfactory nerve, C72.21 — Malignant neoplasm of right olfactory nerve, C72.22 — Malignant neoplasm of left olfactory nerve, C72.30 — Malignant neoplasm of unspecified optic nerve, C72.31 — Malignant neoplasm of right optic nerve, C72.32 — Malignant neoplasm of left optic nerve, C72.40 — Malignant neoplasm of unspecified acoustic nerve, C72.41 — Malignant neoplasm of right acoustic nerve, +212 more

Related risk categories

These categories interact through CMS's HCC hierarchy — one can suppress the other's risk-adjustment weight when both are present on a claim.

Cancer Metastatic to Lung, Liver, Brain, and Other Organs; Acute Myeloid Leukemia Except Promyelocytic, Cancer Metastatic to Bone, Other and Unspecified Metastatic Cancer; Acute Leukemia Except Myeloid, Myelodysplastic Syndromes, Multiple Myeloma, and Other Cancers, Lymphoma and Other Cancers, Bladder, Colorectal, and Other Cancers, Prostate, Breast, and Other Cancers and Tumors

Same clinical category (CCSR)

AHRQ's Clinical Classifications Software groups these diagnoses under the same clinical category (Nervous system cancers - brain).

C70.0 — Malignant neoplasm of cerebral meninges, C70.1 — Malignant neoplasm of spinal meninges, C70.9 — Malignant neoplasm of meninges, unspecified, C71.0 — Malignant neoplasm of cerebrum, except lobes and ventricles, C71.1 — Malignant neoplasm of frontal lobe, C71.2 — Malignant neoplasm of temporal lobe, C71.3 — Malignant neoplasm of parietal lobe, C71.4 — Malignant neoplasm of occipital lobe, C71.5 — Malignant neoplasm of cerebral ventricle, C71.6 — Malignant neoplasm of cerebellum, C71.7 — Malignant neoplasm of brain stem, C71.8 — Malignant neoplasm of overlapping sites of brain

Same Index main term, other category

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

C49.A4 — Gastrointestinal stromal tumor of large intestine (stromal, intestine, malignant, large), C49.A5 — Gastrointestinal stromal tumor of rectum (stromal, gastrointestinal, rectum), C49.A9 — Gastrointestinal stromal tumor of other sites (stromal, gastrointestinal, specified site NEC), C54.0 — Malignant neoplasm of isthmus uteri (stromal, isthmus), C54.1 — Malignant neoplasm of endometrium (stromal), C54.9 — Malignant neoplasm of corpus uteri, unspecified (Müllerian, mixed, unspecified site), C56 — Malignant neoplasm of ovary (Brenner, malignant), C56.9 — Malignant neoplasm of unspecified ovary (yolk sac, unspecified site, female), C62.90 — Malignant neoplasm of unspecified testis, unspecified whether descended or undescended (yolk sac, unspecified site, male), C64 — Malignant neoplasm of kidney, except renal pelvis (Wilms'), C73 — Malignant neoplasm of thyroid gland (Hurthle cell, malignant), C74.0 — Malignant neoplasm of cortex of adrenal gland (adrenal, cortical, malignant), C75.4 — Malignant neoplasm of carotid body (carotid body, malignant), C75.5 — Malignant neoplasm of aortic body and other paraganglia (aortic body, malignant), C79.6 — Secondary malignant neoplasm of ovary (Krukenberg's), C7A.00 — Malignant carcinoid tumor of unspecified site (carcinoid, malignant), C7A.010 — Malignant carcinoid tumor of the duodenum (carcinoid, malignant, duodenum), C7A.011 — Malignant carcinoid tumor of the jejunum (carcinoid, malignant, jejunum), C7A.012 — Malignant carcinoid tumor of the ileum (carcinoid, malignant, ileum), C7A.019 — Malignant carcinoid tumor of the small intestine, unspecified portion (carcinoid, malignant, small intestine), +115 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.

Iron Panel

Contextual Map

Every relationship of C71.9 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

Same site

Referenced by Same-site neoplasm codes

Referenced by Screening & history codes MedCoder-derived

Clinical classification (CCSR)

Risk adjustment (CMS-HCC)

  • HCC 20 — Lung and Other Severe Cancers [CMS-HCC]: “Lung and Other Severe Cancers — supersedes HCC 21 (Lymphoma and Other Cancers), HCC 22 (Bladder, Colorectal, and Other Cancers), HCC 23 (Prostate, Breast, and Other Cancers and Tumors)”— CMS-HCC V28 · 2026

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) · FY2027
  • DRG 054 — NERVOUS SYSTEM NEOPLASMS WITH MCC[MS-DRG]: “NERVOUS SYSTEM NEOPLASMS WITH MCC (MDC 01)”— CMS MS-DRG Definitions Manual (Appendix B) · FY2027
  • DRG 055 — NERVOUS SYSTEM NEOPLASMS WITHOUT MCC[MS-DRG]: “NERVOUS SYSTEM NEOPLASMS WITHOUT MCC (MDC 01)”— CMS MS-DRG Definitions Manual (Appendix B) · FY2027

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

Neoplasm sites (10)

  • Neoplasm, neoplastic, brain NEC — Neoplasm, neoplastic, brain NEC — Malignant, Primary [Neoplasm table]: “Neoplasm, neoplastic, brain NEC (Malignant, Primary)”— CMS Table of Neoplasms · icd10cm-fy2027
  • Neoplasm, neoplastic, cranial (fossa, any) — Neoplasm, neoplastic, cranial (fossa, any) — Malignant, Primary [Neoplasm table]: “Neoplasm, neoplastic, cranial (fossa, any) (Malignant, Primary)”— CMS Table of Neoplasms · icd10cm-fy2027
  • Neoplasm, neoplastic, fossa (of), anterior (cranial) — Neoplasm, neoplastic, fossa (of), anterior (cranial) — Malignant, Primary [Neoplasm table]: “Neoplasm, neoplastic, fossa (of), anterior (cranial) (Malignant, Primary)”— CMS Table of Neoplasms · icd10cm-fy2027
  • Neoplasm, neoplastic, fossa (of), cranial — Neoplasm, neoplastic, fossa (of), cranial — Malignant, Primary [Neoplasm table]: “Neoplasm, neoplastic, fossa (of), cranial (Malignant, Primary)”— CMS Table of Neoplasms · icd10cm-fy2027
  • Neoplasm, neoplastic, fossa (of), middle (cranial) — Neoplasm, neoplastic, fossa (of), middle (cranial) — Malignant, Primary [Neoplasm table]: “Neoplasm, neoplastic, fossa (of), middle (cranial) (Malignant, Primary)”— CMS Table of Neoplasms · icd10cm-fy2027
  • Neoplasm, neoplastic, fossa (of), posterior (cranial) — Neoplasm, neoplastic, fossa (of), posterior (cranial) — Malignant, Primary [Neoplasm table]: “Neoplasm, neoplastic, fossa (of), posterior (cranial) (Malignant, Primary)”— CMS Table of Neoplasms · icd10cm-fy2027
  • Neoplasm, neoplastic, intracranial NEC — Neoplasm, neoplastic, intracranial NEC — Malignant, Primary [Neoplasm table]: “Neoplasm, neoplastic, intracranial NEC (Malignant, Primary)”— CMS Table of Neoplasms · icd10cm-fy2027
  • Neoplasm, neoplastic, motor tract, brain — Neoplasm, neoplastic, motor tract, brain — Malignant, Primary [Neoplasm table]: “Neoplasm, neoplastic, motor tract, brain (Malignant, Primary)”— CMS Table of Neoplasms · icd10cm-fy2027
  • and 2 more

Index entries (30)

  • Astroblastoma, unspecified site[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2027
  • Astrocytoma (cystic), anaplastic, unspecified site[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2027
  • Astrocytoma (cystic), fibrillary, unspecified site[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2027
  • Astrocytoma (cystic), fibrous, unspecified site[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2027
  • Astrocytoma (cystic), gemistocytic, unspecified site[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2027
  • Astrocytoma (cystic), juvenile, unspecified site[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2027
  • Astrocytoma (cystic), pilocytic, unspecified site[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2027
  • Astrocytoma (cystic), piloid, unspecified site[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2027
  • and 22 more

Nearest codes (10)

Change history

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

Deep reference

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

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
Risk adjustment Official source data
2026 Mid-Year Final ICD-10 Mappings + Model Software (cms.gov/files/zip/2026-midyear-final-icd-10-mappings.zip, 2026-midyear-final-model-software.zip) — CMS-HCC V28, PY2026 mid-year final release 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.

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

Labels on this page: Official source data · MedCoder structured relationship · MedCoder 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. "C71.9 — Malignant neoplasm of brain, unspecified." ICD-10-CM FY2027. https://medcoder.ai/icd10/code/c71.9-malignant-neoplasm-of-brain-unspecified

Change history

  • FY2016 — October 1, 2015
    In the code set at ICD-10-CM adoption
    Malignant neoplasm of brain, unspecified

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 C71.9 in its code family, with their registry titles.

View all codes in the C71 family