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C50.219 ICD-10-CM Code: Malignant neoplasm of upper-inner quadrant of unspecified female breast

C50.219 maps to CMS-HCC V28 23. A source-labeled RAF reference is available. Confirm the documented diagnosis and applicable coding requirements. MEAT criteria · RAF Calculator · HCC coding software

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Code lookupC50.219

FY 2026 Apr update / Neoplasms (C00-D49) / Malignant neoplasms of breast (C50)

C50.219

Billable / SpecificICD-10-CMOfficial ICD-10-CMCodebook guidance

Malignant neoplasm of upper-inner quadrant of unspecified female breast

Cancer in the upper-inner quadrant of a female breast where the specific side (left or right) is not identified.

Buddy the Bee presenting code insight

Buddy Insight

Malignant neoplasm of the upper-inner quadrant of unspecified female breast represents invasive breast cancer requiring staging, treatment planning, and ongoing surveillance.

OverviewRisk ModelsCode BookDocumentationAuditNotesEdition comparison

CMS-HCC V28

HCC 23

Coefficient HCC 23: 0.186 (Community Non-Dual Aged (CNA))

CMS-HCC V24

Historical

Historical

Not used for CY2026 payment

ACA/HHS

Context needed

HCC 011, HCC 012

Coefficient needs member context

ESRD/PACE

Context needed

HCC 12

Coefficient needs member context

RXHCC

HCC 22

Code-level coefficient reference

Code Book Path

Official
C50.2Malignant neoplasm of upper-inner quadrant of breastC50.21Malignant neoplasm of upper-inner quadrant of breast, femaleC50.219Malignant neoplasm of upper-inner quadrant of unspecified female breast

Inclusion Terms

Official

No inclusion terms are included in this display for C50.219. Check the code and parent instructions in the Code Book.

Excludes 2

Official

No Excludes 2 notes are included in this display for C50.219. Check the code and parent instructions in the Code Book.

Related Codes

Official
C50.211Malignant neoplasm of upper-inner quadrant of right female breastC50.212Malignant neoplasm of upper-inner quadrant of left female breast

Includes

Official
  • connective tissue of breastInherited from C50
  • Paget's disease of breastInherited from C50
  • Paget's disease of nippleInherited from C50

Excludes 1

Official
  • skin of breast (C44.501, C44.511, C44.521, C44.591)Inherited from C50

Code First

Official

No Code First sequencing instructions are included in this display for C50.219. Check the code and parent instructions in the Code Book.

Use Additional

Official
  • code to identify estrogen, and other hormones and factors receptor status (Z17.-)Inherited from C50

Code Also

Official

No Code Also instructions are included in this display for C50.219. Check the code and parent instructions in the Code Book.

Buddy Documentation Tip

HCC Buddy guidance
Pathologic confirmation of invasive malignancy (biopsy with histologic type — ductal, lobular, etc.)
Laterality must be queried if not documented — right or left breast
Gender documented as female to support gender-specific code selection
Quadrant or subsite location: upper-inner quadrant

MEAT Support

HCC Buddy guidance
Pathologic confirmation of invasive malignancy (biopsy with histologic type — ductal, lobular, etc.)
Laterality must be queried if not documented — right or left breast
Gender documented as female to support gender-specific code selection
Quadrant or subsite location: upper-inner quadrant

Audit Caution

HCC Buddy guidance
Confusing upper-inner (medial, toward sternum) with upper-outer (lateral, toward axilla) — this is the most common quadrant coding error
Not understanding breast quadrant anatomy — upper-inner is the area between the nipple and the sternum, above the horizontal midline
Using wrong gender code — C50.21x is female, C50.22x is male
Not querying for laterality when using unspecified codes

Common Mistakes

HCC Buddy guidance
C50.211 — Right female; preferred when right documented
C50.212 — Left female; preferred when left documented
C50.229 — Same laterality but male breast; verify patient gender
C50.411-C50.419 — Upper-outer quadrant; upper-inner is toward the sternum, upper-outer is toward the axilla — most common confusion

Current with CMS: FY2026 ICD-10-CM Apr 1 update (effective Apr 1 – Sep 30, 2026) · CMS-HCC V28, 100% phased in for payment year 2026. FY2027 code set already staged for October 1, 2026. How HCC Buddy stays current →

Is C50.219 an HCC code?

Yes. C50.219 (Malignant neoplasm of upper-inner quadrant of unspecified female breast) maps to HCC 23, Prostate, Breast, and Other Cancers and Tumors under the CMS-HCC V28 risk adjustment model, with a source-labeled community non-dual aged reference coefficient of 0.186. Source-labeled code-level coefficients are references, not member totals. Actual contribution depends on complete member context, hierarchy and cleanup rules, interactions, and model year. HCC Buddy's RAF Calculator supports CMS-HCC V28 PY2026 and shows no score unless every required source and calculation check passes. It is billable for payment year 2026.

Coder answer: C50.219 is billable and maps to V28 HCC 23, Prostate, Breast, and Other Cancers and Tumors. Open it in the Code Book for the tabular path, RAF, and MEAT checklist.

Code
C50.219
Description
Malignant neoplasm of upper-inner quadrant of unspecified female breast
HCC (V28)
HCC 23 — Prostate, Breast, and Other Cancers and Tumors
RAF reference coefficient
0.186
Billable
Yes
Payment year
2026

HCC Category Mapping

V28HCC 23, Prostate, Breast, and Other Cancers and Tumors
0.186
RxHCCHCC 22, Prostate, Breast, Bladder, and Other Cancers and Tumors
Not separately weighted

These are source-labeled model coefficients, not member totals. A category may still be removed by hierarchy or model cleanup rules. Weights are not directly comparable across models: CMS-HCC V28 and V24 use Community, Non-Dual, Aged; ESRD uses the dialysis continuing-enrollee model; RxHCC is the Part D continuing-enrollee, non-low-income, aged weight (a larger scale than CMS-HCC). ACA/HHS has no single weight — it varies by metal level. Actual per-patient RAF contribution depends on member context, hierarchy and cleanup rules, interactions, and the model year used by the payer. V28 is the CMS-HCC model phased in over payment years 2024–2026; V24 remains available for historical review.

Work C50.219 in the Code Book — tabular path, V28 RAF reference, and MEAT checklist →

MEAT review for C50.219

For C50.219, confirm that the documentation supports the diagnosis and meets the applicable coding, encounter, program and payer requirements. MEAT (Monitor, Evaluate, Assess, or Treat) is a review mnemonic, not a universal CMS coding rule.

  • MMonitor: signs, symptoms, disease progression, or lab trending documented in the note
  • EEvaluate: test results, medication response, or physical findings reviewed by the provider
  • AAssess: explicit mention in the assessment or plan with acknowledgment of status
  • TTreat: medication, referral, procedure, therapy, or counseling tied to the diagnosis

Coder workflow notes

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What This Code Means

C50.219 is the ICD-10-CM diagnosis code for malignant neoplasm of upper-inner quadrant of unspecified female breast. Cancer in the upper-inner quadrant of a female breast where the specific side (left or right) is not identified. C50.219 sits in the ICD-10-CM chapter for neoplasms (c00-d49), within the section covering malignant neoplasms of breast (c50).

Under the CMS-HCC V28 risk adjustment model, C50.219 maps to Prostate, Breast, and Other Cancers and Tumors (HCC 23) with a source-labeled community, non-dual, aged reference coefficient of 0.186. For CY2026 non-PACE Medicare Advantage, CMS uses 100% of the 2024 CMS-HCC model (V28). PACE uses a separate model blend. Source-labeled code-level coefficients are references, not member totals. Actual contribution depends on complete member context, hierarchy and cleanup rules, interactions, and model year. HCC Buddy's RAF Calculator supports CMS-HCC V28 PY2026 and shows no score unless every required source and calculation check passes.

This unspecified code should only be used when laterality cannot be determined from documentation. For C50.219, confirm that the documentation supports the diagnosis and meets the applicable coding, encounter, program and payer requirements. MEAT (Monitor, Evaluate, Assess, or Treat) is a review mnemonic, not a universal CMS coding rule. When documentation is ambiguous, coders should issue a provider query rather than assume the highest-specificity variant.

HCC Buddy maintains structured V28 and V24 mapping, source-labeled coefficient references, and MEAT documentation criteria for C50.219 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.

Coding Tips

  • •This unspecified code should only be used when laterality cannot be determined from documentation
  • •Query the provider if possible to determine whether the cancer is in the right or left breast for more specific coding

Clinical Significance

Malignant neoplasm of the upper-inner quadrant of unspecified female breast represents invasive breast cancer requiring staging, treatment planning, and ongoing surveillance. Breast cancer is risk-adjusted because it demands significant healthcare resources including surgery, radiation, chemotherapy, hormonal therapy, and long-term monitoring. The unspecified laterality indicates documentation does not identify the affected side, which should trigger a provider query.

Documentation Requirements

  • ✓Pathologic confirmation of invasive malignancy (biopsy with histologic type — ductal, lobular, etc.)
  • ✓Laterality must be queried if not documented — right or left breast
  • ✓Gender documented as female to support gender-specific code selection
  • ✓Quadrant or subsite location: upper-inner quadrant
  • ✓Tumor size (T stage) and grade
  • ✓Lymph node status (N stage) — axillary, sentinel node biopsy results
  • ✓Estrogen receptor, progesterone receptor, and HER2 status
  • ✓Stage grouping (I-IV)
  • ✓Current treatment status (active treatment, hormonal therapy, surveillance)

Commonly Confused Codes

  • •C50.211: Right female; preferred when right documented
  • •C50.212: Left female; preferred when left documented
  • •C50.229: Same laterality but male breast; verify patient gender
  • •C50.411-C50.419: Upper-outer quadrant; upper-inner is toward the sternum, upper-outer is toward the axilla: most common confusion
  • •C50.111-C50.119: Central portion; adjacent to upper-inner but anatomically distinct
  • •C50.311-C50.319: Lower-inner quadrant; same medial orientation but lower position

Child Codes

C50.211Malignant neoplasm of upper-inner quadrant of right female breast
HCC 22
C50.212Malignant neoplasm of upper-inner quadrant of left female breast
HCC 22
C50.219Malignant neoplasm of upper-inner quadrant of unspecified female breast
HCC 22

Code Hierarchy

└C50Malignant neoplasm of breast└C50.2Malignant neoplasm of upper-inner quadrant of breast└C50.21Malignant neoplasm of upper-inner quadrant of breast, female└C50.219Malignant neoplasm of upper-inner quadrant of unspecified female breast
└C50.219Malignant neoplasm of upper-inner quadrant of unspecified female breast

Also searched as

  • C50 219
  • C50219

For C50.219, confirm that the documentation supports the diagnosis and meets the applicable coding, encounter, program and payer requirements. MEAT (Monitor, Evaluate, Assess, or Treat) is a review mnemonic, not a universal CMS coding rule.

C50.219 maps to CMS-HCC V28 category 23, Prostate, Breast, and Other Cancers and Tumors. See the ICD-10 to HCC mapping hub for how the V28 crosswalk works. The mapping identifies a payment HCC category for C50.219. Review its source-labeled HCC coefficient above, check the RAF Calculator with complete member context for CMS-HCC V28 PY2026, and confirm the documentation the chart needs before the code is submitted. HCC Buddy shows no RAF score unless every required source and calculation check passes.

More on C50.219

Code family

Every C50 code with its CMS-HCC V28 statusMalignant neoplasm of breast, 57 billable codes

Related condition guides

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