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C65.1 ICD-10-CM Code: Malignant neoplasm of right renal pelvis

Compare with another code for C65.1Check 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
Risk adjustment
CMS-HCC V28: 1 category · CMS-HCC V22 category 11 · RxHCC V08 category 20

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.

Includesfrom C65What C65 covers
  • malignant neoplasm of pelviureteric junction
  • malignant neoplasm of renal calyces

Where it sits Source: CMS/NCHS

Under:Chapter 2: NeoplasmsC00-C96 Malignant neoplasmsC00-C75 Malignant neoplasms, stated or presumed to be primary (of specified sites), and certain specified histologies, except neuroendocrine, and of lymphoid, hematopoietic and related tissueC64-C68 Malignant neoplasms of urinary tractC65 Malignant neoplasm of renal pelvis

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 656 — KIDNEY AND URETER PROCEDURES FOR NEOPLASM WITH MCC (MDC 11)
  • MS-DRG 657 — KIDNEY AND URETER PROCEDURES FOR NEOPLASM WITH CC (MDC 11)
  • MS-DRG 658 — KIDNEY AND URETER PROCEDURES FOR NEOPLASM WITHOUT CC/MCC (MDC 11)
  • MS-DRG 686 — KIDNEY AND URINARY TRACT NEOPLASMS WITH MCC (MDC 11)
  • MS-DRG 687 — KIDNEY AND URINARY TRACT NEOPLASMS WITH CC (MDC 11)
  • MS-DRG 688 — KIDNEY AND URINARY TRACT NEOPLASMS WITHOUT CC/MCC (MDC 11)

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 22 — Bladder, Colorectal, and Other Cancers (supersedes HCC 23)

Other models: CMS-HCC V22 HCC 11 · RxHCC V08 HCC 20

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 C65.1 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 C65.1 itself; “inherited from” names the category or block whose note applies here.

Includes

Conditions the official ICD-10-CM tabular list includes under this code.

  • malignant neoplasm of pelviureteric junction
  • malignant neoplasm of renal calyces

Source: inherited from C65

Coder workflow for C65.1

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

Before you code C65.1

  1. Laterality is coded in this family. Confirm the side documented — right, left, or bilateral — and select the matching code (this page’s code: right). The unspecified-side code applies only when the record states no side. Laterality is assigned from the documented side; where a bilateral code exists and both sides are documented, it is used instead of two unilateral codes (Guidelines I.B.13).

    ReviewC65.2 · left, C65.9 · unspecified

    Guide: Laterality coding →

  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 →

Choose the right path

  1. Is the side documented?
    Yes → Select the code for the documented side (or the bilateral code when both sides are documented and one exists).
    No → Use the unspecified-side code only when the record states no side; a query is the alternative.

    ReviewC65.2 · left, C65.9 · unspecified

Consider C65.1. 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.
Laterality
Right, left or bilateral as documented; unspecified only when the record states no side (Guidelines I.B.13).
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).

Coding decision scenarios

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

Documentation: The record documents the condition on one side only.

Coding question: Which code in this family applies?

Path: Select the sibling code for the documented side.

Reason: Laterality is assigned from the documented side; the unspecified-side code is for records that state no side (Guidelines I.B.13).

ReviewC65.2 · left, C65.9 · unspecified

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 C65.1 with…

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

The codes most likely to be picked instead of C65.1 — 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.

  • C65.9— 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 “Malignant neoplasm of unspecified renal pelvis” takes C65.9; specificity in the record moves it back here.

    Full comparison: C65.1 vs C65.9 →

  • C65.2— Laterality relationship (Review)

    Same condition; these differ only in which side is documented.

    The same condition with a different side named (the opposite side, both sides, or none); the documented side decides, and a bilateral code, where one exists, replaces the pair when both sides are documented.

    What moves you there: A documented left side moves the case to C65.2.

    Full comparison: C65.1 vs C65.2 →

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

Malignant neoplasm of right renal pelvis is a billable ICD-10-CM diagnosis code (C65.1).

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

  • 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 C65.1 or its code family, from the CMS ICD-10-CM tabular instructional notes, the CMS Table of Neoplasms and the CMS Table of Neoplasms (site match derived from the code title). Tabular-note edges are stored at the code family level that carries each note.

Referenced by 1 Excludes1 note: C64 — Malignant neoplasm of kidney, except renal pelvis (via C65.-).

These codes’ tabular lists mark this diagnosis as mutually exclusive — not reported together unless the conditions are documented as unrelated.

Referenced by 6 Same-site neoplasm codes: C79.0 — Secondary malignant neoplasm of kidney and renal pelvis (via C65.-)Compare C65.1 vs C79.0 →, D09.19 — Carcinoma in situ of other urinary organs (via C65.-)Compare C65.1 vs D09.19 →, D30.1 — Benign neoplasm of renal pelvis (via C65.-)Compare C65.1 vs D30.1 →, D41.1 — Neoplasm of uncertain behavior of renal pelvis (via C65.-)Compare C65.1 vs D41.1 →, D49.51 — Neoplasm of unspecified behavior of kidney (via C65.-)Compare C65.1 vs D49.51 →, D49.59 — Neoplasm of unspecified behavior of other genitourinary organ (via C65.-)Compare C65.1 vs D49.59 →.

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

Referenced by 7 Screening & history codes: Z80.51 — Family history of malignant neoplasm of kidney (via C65.-)Compare C65.1 vs Z80.51 →, Z85.04 — Personal history of malignant neoplasm of rectum, rectosigmoid junction, and anus (via C65.-)Compare C65.1 vs Z85.04 →, Z85.048 — Personal history of other malignant neoplasm of rectum, rectosigmoid junction, and anus (via C65.-)Compare C65.1 vs Z85.048 →, Z85.52 — Personal history of malignant neoplasm of kidney (via C65.-)Compare C65.1 vs Z85.52 →, Z85.520 — Personal history of malignant carcinoid tumor of kidney (via C65.-)Compare C65.1 vs Z85.520 →, Z85.528 — Personal history of other malignant neoplasm of kidney (via C65.-)Compare C65.1 vs Z85.528 →, Z85.53 — Personal history of malignant neoplasm of renal pelvis (via C65.-)Compare C65.1 vs Z85.53 →.

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 27 clinically related codes on its CMS exclusion list.

Named in the grouper logic of 6 MS-DRGs: DRG 656 (MDC 11), DRG 657 (MDC 11), DRG 658 (MDC 11), DRG 686 (MDC 11), DRG 687 (MDC 11), DRG 688 (MDC 11).

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

Clinical classification (AHRQ CCSR):NEO044 — Urinary system cancers - ureter and renal pelvis (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.

C45.7 — Mesothelioma of other sites, C45.9 — Mesothelioma, unspecified, C64.1 — Malignant neoplasm of right kidney, except renal pelvis, C64.2 — Malignant neoplasm of left kidney, except renal pelvis, C64.9 — Malignant neoplasm of unspecified kidney, except renal pelvis, C65.2 — Malignant neoplasm of left renal pelvis, C65.9 — Malignant neoplasm of unspecified renal pelvis, C68.8 — Malignant neoplasm of overlapping sites of urinary organs, C68.9 — Malignant neoplasm of urinary organ, unspecified, C76.8 — Malignant neoplasm of other specified ill-defined sites, C7A.00 — Malignant carcinoid tumor of unspecified site, C7A.093 — Malignant carcinoid tumor of the kidney, C7A.098 — Malignant carcinoid tumors of other sites, C7A.1 — Malignant poorly differentiated neuroendocrine tumors, C7A.8 — Other malignant neuroendocrine tumors, C7B.00 — Secondary carcinoid tumors, unspecified site, C7B.1 — Secondary Merkel cell carcinoma, C80.0 — Disseminated malignant neoplasm, unspecified, C80.1 — Malignant (primary) neoplasm, unspecified, D49.511 — Neoplasm of unspecified behavior of right kidney, +6 more

Same condition, different side

Same title, differing only in which side of the body it names: right, left, bilateral or unspecified.

C65.2 — Malignant neoplasm of left renal pelvis (left)Compare C65.1 vs C65.2 →, C65.9 — Malignant neoplasm of unspecified renal pelvis (unspecified)Compare C65.1 vs C65.9 →

Same CMS-HCC risk category (V28)

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

C57.22 — Malignant neoplasm of left round ligament, C57.3 — Malignant neoplasm of parametrium, C57.4 — Malignant neoplasm of uterine adnexa, unspecified, C57.7 — Malignant neoplasm of other specified female genital organs, C57.8 — Malignant neoplasm of overlapping sites of female genital organs, C57.9 — Malignant neoplasm of female genital organ, unspecified, C58 — Malignant neoplasm of placenta, C64.1 — Malignant neoplasm of right kidney, except renal pelvis, C64.2 — Malignant neoplasm of left kidney, except renal pelvis, C64.9 — Malignant neoplasm of unspecified kidney, except renal pelvis, C65.2 — Malignant neoplasm of left renal pelvis, C65.9 — Malignant neoplasm of unspecified renal pelvis, C66.1 — Malignant neoplasm of right ureter, C66.2 — Malignant neoplasm of left ureter, C66.9 — Malignant neoplasm of unspecified ureter, C67.0 — Malignant neoplasm of trigone of bladder, C67.1 — Malignant neoplasm of dome of bladder, C67.2 — Malignant neoplasm of lateral wall of bladder, C67.3 — Malignant neoplasm of anterior wall of bladder, C67.4 — Malignant neoplasm of posterior wall of bladder, +105 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, Lung and Other Severe Cancers, Lymphoma 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 (Urinary system cancers - ureter and renal pelvis).

C65.2 — Malignant neoplasm of left renal pelvis, C65.9 — Malignant neoplasm of unspecified renal pelvis, C66.1 — Malignant neoplasm of right ureter, C66.2 — Malignant neoplasm of left ureter, C66.9 — Malignant neoplasm of unspecified ureter

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.

Gamma-glutamyl Transferase (GGT) Test, Iron Panel, Prothrombin Time Test and INR (PT/INR)

Contextual Map

Every relationship of C65.1 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 C65.1 with this related code in Claim Check

Hierarchy

Referenced by Excludes1 notes

Referenced by Same-site neoplasm codes

Referenced by Screening & history codes MedCoder-derived

Clinical classification (CCSR)

Risk adjustment (CMS-HCC)

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

MS-DRG Grouper

MDC crossing

  • MDC 11 — Diseases and Disorders of the Kidney and Urinary Tract[MDC crossing]: “Diseases and Disorders of the Kidney and Urinary Tract — 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. 3,578 same-MDC procedures group here; browse them on the MDC page.”— CMS MS-DRG Definitions Manual · FY2027

Neoplasm sites (9)

  • Neoplasm, neoplastic, calyx, renal — Neoplasm, neoplastic, calyx, renal — Malignant, Primary [Neoplasm table]: “Neoplasm, neoplastic, calyx, renal (Malignant, Primary)”— CMS Table of Neoplasms · icd10cm-fy2027
  • Neoplasm, neoplastic, junction, pelviureteric — Neoplasm, neoplastic, junction, pelviureteric — Malignant, Primary [Neoplasm table]: “Neoplasm, neoplastic, junction, pelviureteric (Malignant, Primary)”— CMS Table of Neoplasms · icd10cm-fy2027
  • Neoplasm, neoplastic, kidney (parenchymal), calyx — Neoplasm, neoplastic, kidney (parenchymal), calyx — Malignant, Primary [Neoplasm table]: “Neoplasm, neoplastic, kidney (parenchymal), calyx (Malignant, Primary)”— CMS Table of Neoplasms · icd10cm-fy2027
  • Neoplasm, neoplastic, kidney (parenchymal), hilus — Neoplasm, neoplastic, kidney (parenchymal), hilus — Malignant, Primary [Neoplasm table]: “Neoplasm, neoplastic, kidney (parenchymal), hilus (Malignant, Primary)”— CMS Table of Neoplasms · icd10cm-fy2027
  • Neoplasm, neoplastic, kidney (parenchymal), pelvis — Neoplasm, neoplastic, kidney (parenchymal), pelvis — Malignant, Primary [Neoplasm table]: “Neoplasm, neoplastic, kidney (parenchymal), pelvis (Malignant, Primary)”— CMS Table of Neoplasms · icd10cm-fy2027
  • Neoplasm, neoplastic, pelvis, pelvic, renal — Neoplasm, neoplastic, pelvis, pelvic, renal — Malignant, Primary [Neoplasm table]: “Neoplasm, neoplastic, pelvis, pelvic, renal (Malignant, Primary)”— CMS Table of Neoplasms · icd10cm-fy2027
  • Neoplasm, neoplastic, renal, calyx — Neoplasm, neoplastic, renal, calyx — Malignant, Primary [Neoplasm table]: “Neoplasm, neoplastic, renal, calyx (Malignant, Primary)”— CMS Table of Neoplasms · icd10cm-fy2027
  • Neoplasm, neoplastic, renal, hilus — Neoplasm, neoplastic, renal, hilus — Malignant, Primary [Neoplasm table]: “Neoplasm, neoplastic, renal, hilus (Malignant, Primary)”— CMS Table of Neoplasms · icd10cm-fy2027
  • and 1 more

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.

Neoplasm Table Sites (9)

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, calyx, renal — Malignant, Primary
  • Neoplasm, neoplastic, junction, pelviureteric — Malignant, Primary
  • Neoplasm, neoplastic, kidney (parenchymal), calyx — Malignant, Primary
  • Neoplasm, neoplastic, kidney (parenchymal), hilus — Malignant, Primary
  • Neoplasm, neoplastic, kidney (parenchymal), pelvis — Malignant, Primary
  • Neoplasm, neoplastic, pelvis, pelvic, renal — Malignant, Primary
  • Neoplasm, neoplastic, renal, calyx — Malignant, Primary
  • Neoplasm, neoplastic, renal, hilus — Malignant, Primary
  • Neoplasm, neoplastic, renal, pelvis — Malignant, Primary

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-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. "C65.1 — Malignant neoplasm of right renal pelvis." ICD-10-CM FY2027. https://medcoder.ai/icd10/code/c65.1-malignant-neoplasm-of-right-renal-pelvis

Change history

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

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 C65.1 in its code family, with their registry titles.

View all codes in the C65 family