What is ICD-10 code D33.0?

D33.0 is the ICD-10-CM diagnosis code for Benign neoplasm of brain, supratentorial. A non-cancerous tumor located in the upper portion of the brain above the tentorium cerebelli. It belongs to the ICD-10-CM chapter for neoplasms (c00-d49). D33.0 is a billable code, meaning it can be reported on a claim as a primary or secondary diagnosis when supported by documentation. D33.0 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. D33.0 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. D33.0 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 D33.0?

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. For D33.0, V28 maps to Melanoma and Other Skin Cancers at RAF 0.251 while V24 mapped to Breast, Prostate, and Other Cancers and Tumors at RAF 0.150. Both models can still appear in legacy data and in payer-specific lookback periods.

What should coders know when reporting D33.0?

Supratentorial refers to the area above the tentorium; document this location clearly in the medical record Distinguish between supratentorial and infratentorial locations as they have different treatment implications Because D33.0 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.

D33.0 ICD-10 Code: Benign neoplasm of brain

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 lookupD33.0Effective periodFY2026 Apr Update (Apr 1-Sep 30)

FY 2026 Apr update / Neoplasms (C00-D49) / Benign neoplasms, except benign neuroendocrine tumors (D10-D36)

D33.0

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

Benign neoplasm of brain, supratentorial

A non-cancerous tumor located in the upper portion of the brain above the tentorium cerebelli.

Buddy Insight

CMS-HCC V28

Mapped

HCC 23

Melanoma and Other Skin Cancers

RAF 0.251

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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Code Book Path

Official

D33Benign neoplasm of brain and other parts of central nervous system

D33.0Benign neoplasm of brain, supratentorial

Inclusion Terms

Official

Benign neoplasm of cerebral ventricle
Benign neoplasm of cerebrum
Benign neoplasm of frontal lobe
Benign neoplasm of occipital lobe
Benign neoplasm of parietal lobe

Excludes 2

Official

ICD-10-CM does not list Excludes 2 notes for D33.0 in this effective period.

Related Child Codes

Official

D33.1Benign neoplasm of brain, infratentorial

D33.2Benign neoplasm of brain, unspecified

D33.3Benign neoplasm of cranial nerves

D33.4Benign neoplasm of spinal cord

D33.7Benign neoplasm of other specified parts of central nervous system

Includes

Official

ICD-10-CM does not list Includes notes for D33.0 in this effective period.

Excludes 1

Official

benign neoplasm of fourth ventricle (D33.1)

Code First

Official

ICD-10-CM does not list Code First sequencing instructions for D33.0 in this effective period.

Use Additional

Official

ICD-10-CM does not list Use Additional Code instructions for D33.0 in this effective period.

Code Also

Official

ICD-10-CM does not list Code Also instructions for D33.0 in this effective period.

Buddy Documentation Tip

HCC Buddy guidance

MRI brain documenting the tumor location as supratentorial with characteristic imaging features.

If resected, pathology must confirm benign WHO grade.

Document the specific location within the supratentorial compartment, tumor dimensions, associated symptoms (seizures, headaches, neurological deficits), and management approach.

Surveillance imaging interval should be specified.

MEAT Support

HCC Buddy guidance

MRI brain documenting the tumor location as supratentorial with characteristic imaging features.

If resected, pathology must confirm benign WHO grade.

Document the specific location within the supratentorial compartment, tumor dimensions, associated symptoms (seizures, headaches, neurological deficits), and management approach.

Surveillance imaging interval should be specified.

Audit Caution

HCC Buddy guidance

The distinction between supratentorial (D33.0) and infratentorial (D33.1) is determined by the tumor's relationship to the tentorium cerebelli

review imaging carefully. Benign status must be confirmed by pathology or characteristic imaging

if uncertain, use D43.0 instead. Do not confuse with meningiomas, which use D32 series codes.

Common Mistakes

HCC Buddy guidance

D33.1 (infratentorial brain) is for tumors in the posterior fossa

D33.2 (brain, unspecified) is used when the supratentorial vs. infratentorial distinction is not documented

D32.0 (cerebral meninges) is for meningeal rather than parenchymal tumors

D43.0 (neoplasm of uncertain behavior, supratentorial) is for tumors with indeterminate biological behavior.

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 D33.0 an HCC code?

Yes. D33.0 maps to Melanoma and Other Skin Cancers under the CMS-HCC V28 risk adjustment model (and Breast, Prostate, and Other Cancers and Tumors under V24).

HCC Category Mapping

V28HCC 23, Melanoma and Other Skin Cancers

0.251

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 D33.0

For D33.0to 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 D33.0 during that encounter, not just copy-forwarded from a problem list.

What This Code Means

D33.0 is the ICD-10-CM diagnosis code for benign neoplasm of brain, supratentorial. A non-cancerous tumor located in the upper portion of the brain above the tentorium cerebelli. D33.0 sits in the ICD-10-CM chapter for neoplasms (c00-d49), within the section covering benign neoplasms, except benign neuroendocrine tumors (d10-d36).

Under the CMS-HCC V28 risk adjustment model, D33.0 maps to Melanoma and Other Skin Cancers (HCC 23) with a community, non-dual, aged base RAF weight of 0.251. Under the older CMS-HCC V24 model, D33.0 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.

Supratentorial refers to the area above the tentorium; document this location clearly in the medical record. Because D33.0 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 D33.0 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.

Coding Tips

•Supratentorial refers to the area above the tentorium; document this location clearly in the medical record
•Distinguish between supratentorial and infratentorial locations as they have different treatment implications

Clinical Significance

Benign neoplasm of the supratentorial brain encompasses benign tumors located above the tentorium cerebelli, including tumors of the cerebral hemispheres, basal ganglia, thalamus, and ventricular system. Common supratentorial benign tumors include low-grade gliomas, craniopharyngiomas, and choroid plexus papillomas. Despite their benign histology, these tumors can cause significant morbidity due to mass effect, seizures, and hydrocephalus.

Documentation Requirements

✓MRI brain documenting the tumor location as supratentorial with characteristic imaging features.
✓If resected, pathology must confirm benign WHO grade.
✓Document the specific location within the supratentorial compartment, tumor dimensions, associated symptoms (seizures, headaches, neurological deficits), and management approach.
✓Surveillance imaging interval should be specified.

Excludes 1, Do NOT code together

benign neoplasm of fourth ventricle (D33.1)

Commonly Confused Codes

•D33.1 (infratentorial brain) is for tumors in the posterior fossa
•D33.2 (brain, unspecified) is used when the supratentorial vs. infratentorial distinction is not documented
•D32.0 (cerebral meninges) is for meningeal rather than parenchymal tumors
•D43.0 (neoplasm of uncertain behavior, supratentorial) is for tumors with indeterminate biological behavior.