What is ICD-10 code C50.221?

C50.221 is the ICD-10-CM diagnosis code for Malignant neoplasm of upper-inner quadrant of right male breast. Cancer that starts in the upper-inner area of the right breast in a male patient. It belongs to the ICD-10-CM chapter for neoplasms (c00-d49). C50.221 is a billable code, meaning it can be reported on a claim as a primary or secondary diagnosis when supported by documentation. C50.221 is part of the FY2026 ICD-10-CM code set published by the CMS National Center for Health Statistics and used on Medicare, Medicaid, and commercial claims in the United States.

Yes. C50.221 is a billable ICD-10-CM code that can be reported on professional and institutional claims as a primary or secondary diagnosis when the provider documentation supports the specific condition described. Billable codes in ICD-10-CM are coded to the highest level of specificity available for the documented diagnosis. C50.221 is current for fiscal year 2026 and remains in the active CMS ICD-10-CM code set published by the National Center for Health Statistics.

What is the V28 vs V24 difference for C50.221?

CMS phased in the V28 risk adjustment model over payment years 2024 (33%), 2025 (67%), and 2026 (100%), replacing V24. V28 consolidates HCC categories, removes some lower-acuity conditions, and recalibrates RAF weights across the entire model. C50.221 was a payment HCC under V24 (Breast, Prostate, and Other Cancers and Tumors) but the V28 recalibration removed it from the risk adjustment model. Both models can still appear in legacy data and in payer-specific lookback periods.

What should coders know when reporting C50.221?

Verify the laterality (right breast) and gender (male) are clearly documented in the medical record Ensure this code is used only for invasive malignant neoplasms; use different codes for carcinoma in situ Because C50.221 maps to a payment HCC, the documentation must also satisfy MEAT criteria (Monitor, Evaluate, Assess, or Treat) for the encounter to count toward the patient's risk adjustment score.

C50.221 ICD-10 Code: Malignant neoplasm

ICD-10-CM Code View

HCC Buddy Code Card

Digital ICD-10 code-book layout with official code detail, always-visible risk models, Code Trumping, and Buddy coding guidance.

Code lookupC50.221Effective periodFY2026 Apr Update (Apr 1-Sep 30)

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

C50.221

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

Malignant neoplasm of upper-inner quadrant of right male breast

Cancer that starts in the upper-inner area of the right breast in a male patient.

Buddy Insight

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

CMS-HCC V28

Not risk-adjusted for this model/period.

RAF 0

CMS-HCC V24

Mapped

HCC 12

Breast, Prostate, and Other C...

RAF 0.150

ACA/HHS

Not risk-adjusted for this model/period.

RAF 0

ESRD/PACE

Mapped

HCC 12

Breast, Prostate, and Other C...

RAF 0.0

RXHCC

Mapped

HCC 22

Cancer, Other Specified Sites

RAF 0.0

Code Trumping

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Compare selected patient codes to show trumped or trumps impact.

Code Book Path

Official

C50.2Malignant neoplasm of upper-inner quadrant of breast

C50.22Malignant neoplasm of upper-inner quadrant of breast, male

C50.221Malignant neoplasm of upper-inner quadrant of right male breast

Inclusion Terms

Official

ICD-10-CM does not list inclusion terms for C50.221 in this effective period.

Excludes 2

Official

ICD-10-CM does not list Excludes 2 notes for C50.221 in this effective period.

Related Child Codes

Official

C50.222Malignant neoplasm of upper-inner quadrant of left male breast

C50.229Malignant neoplasm of upper-inner quadrant of unspecified male breast

Includes

Official

ICD-10-CM does not list Includes notes for C50.221 in this effective period.

Excludes 1

Official

ICD-10-CM does not list Excludes 1 notes for C50.221 in this effective period.

Code First

Official

ICD-10-CM does not list Code First sequencing instructions for C50.221 in this effective period.

Use Additional

Official

ICD-10-CM does not list Use Additional Code instructions for C50.221 in this effective period.

Code Also

Official

ICD-10-CM does not list Code Also instructions for C50.221 in this effective period.

Buddy Documentation Tip

HCC Buddy guidance

Pathologic confirmation of invasive malignancy (biopsy with histologic type — ductal, lobular, etc.)

Laterality: right breast

Gender documented as male 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: right breast

Gender documented as male to support gender-specific code selection

Quadrant or subsite location: upper-inner quadrant

Audit Caution

HCC Buddy guidance

Selecting female breast codes (C50.21x) instead of male codes (C50.22x)

Confusing upper-inner with upper-outer quadrant — inner is toward the sternum, outer is toward the axilla

Male breast cancer is rare; documentation must explicitly confirm malignancy, not just a breast mass

Selecting wrong laterality — verify right side from documentation

Common Mistakes

HCC Buddy guidance

C50.222 — Upper-inner quadrant of left male breast; verify laterality

C50.229 — Upper-inner quadrant unspecified male; use only when laterality unknown

C50.211 — Same laterality but female breast; verify patient gender

C50.421-C50.429 — Upper-outer quadrant of male breast; inner vs. outer confusion

Last updated: FY2026 ICD-10-CM Apr update, Apr 1, 2026 through Sep 30, 2026. CMS-HCC V28 is 100% phased in for payment year 2026.

Is C50.221 an HCC code?

Yes. C50.221 maps to Breast, Prostate, and Other Cancers and Tumors under the V24 model but is not retained in V28.

HCC Category Mapping

V24HCC 12, Breast, Prostate, and Other Cancers and Tumors

0.150

ESRDHCC 12, Breast, Prostate, and Other Cancers and Tumors

0.000

RxHCCHCC 22, Cancer, Other Specified Sites

0.000

RAF weights shown are the community, non-dual, aged base weights from the CMS risk adjustment model file. Actual per-patient RAF contribution depends on member segment, interactions, and the model year used by the payer. V28 is the CMS-HCC model phased in over payment years 2024–2026; V24 remains in use during the transition and for historical data.

MEAT Criteria for C50.221

For C50.221to count as a valid HCC diagnosis in a given encounter, the provider's documentation must show MEAT: Monitor, Evaluate, Assess, or Treat. A diagnosis from a prior year does not carry forward automatically, it has to be re-documented and supported each calendar year.

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

Only one of M/E/A/T is required to support the code, but the documentation must be specific enough to show that the provider actually addressed C50.221 during that encounter, not just copy-forwarded from a problem list.

What This Code Means

C50.221 is the ICD-10-CM diagnosis code for malignant neoplasm of upper-inner quadrant of right male breast. Cancer that starts in the upper-inner area of the right breast in a male patient. C50.221 sits in the ICD-10-CM chapter for neoplasms (c00-d49), within the section covering malignant neoplasms of breast (c50).

Under the older CMS-HCC V24 model, C50.221 maps to Breast, Prostate, and Other Cancers and Tumors (HCC 12) with a community, non-dual, aged base RAF weight of 0.150. V28 is the CMS-HCC risk adjustment model that reached 100% phase-in for payment year 2026, replacing V24 which was used during the PY2024–PY2025 transition.

Verify the laterality (right breast) and gender (male) are clearly documented in the medical record. Because C50.221 maps to a payment HCC, the provider's documentation must satisfy MEAT criteria (Monitor, Evaluate, Assess, or Treat) for the encounter to count toward the patient's Medicare Advantage risk adjustment score. 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, RAF weights, and MEAT documentation criteria for C50.221 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.

Coding Tips

•Verify the laterality (right breast) and gender (male) are clearly documented in the medical record
•Ensure this code is used only for invasive malignant neoplasms; use different codes for carcinoma in situ

Clinical Significance

Malignant neoplasm of the upper-inner quadrant of right male 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. Male breast cancer accounts for less than 1% of all breast cancers, making accurate gender-specific coding particularly important for tracking and research.

Documentation Requirements

✓Pathologic confirmation of invasive malignancy (biopsy with histologic type — ductal, lobular, etc.)
✓Laterality: right breast
✓Gender documented as male 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

•C50.222 — Upper-inner quadrant of left male breast; verify laterality
•C50.229 — Upper-inner quadrant unspecified male; use only when laterality unknown
•C50.211 — Same laterality but female breast; verify patient gender
•C50.421-C50.429 — Upper-outer quadrant of male breast; inner vs. outer confusion
•C50.121-C50.129 — Central portion of male breast; adjacent but distinct subsite
•N62 — Gynecomastia; benign condition, not malignant

Child Codes

C50.221Malignant neoplasm of upper-inner quadrant of right male breast

C50.222Malignant neoplasm of upper-inner quadrant of left male breast

C50.229Malignant neoplasm of upper-inner quadrant of unspecified male breast

Code Hierarchy

└C50Malignant neoplasm of breast └C50.2Malignant neoplasm of upper-inner quadrant of breast └C50.22Malignant neoplasm of upper-inner quadrant of breast, male └C50.221Malignant neoplasm of upper-inner quadrant of right male breast

└C50.221Malignant neoplasm of upper-inner quadrant of right male breast

HCC Buddy Code Card

C50.221

Is C50.221 an HCC code?

HCC Category Mapping

MEAT Criteria for C50.221

What This Code Means

Coding Tips

Clinical Significance

Documentation Requirements

Commonly Confused Codes

Child Codes

Code Hierarchy

More on C50.221

Related condition guides

Open C50.221 in the Interactive Encoder

C50.221 ICD-10-CM Code: Malignant neoplasm of upper-inner quadrant of right male breast

HCC Buddy Code Card

C50.221

Is C50.221 an HCC code?

HCC Category Mapping

MEAT Criteria for C50.221

What This Code Means

Coding Tips

Clinical Significance

Documentation Requirements

Commonly Confused Codes

Child Codes

Code Hierarchy

More on C50.221

Related condition guides

Open C50.221 in the Interactive Encoder