What is Hillis Warren's specialty?

Hillis Warren (NPI 1801999602) is a Medicare-billing provider whose primary specialty is Ophthalmology in Sacramento, CA.

Where does Hillis Warren practice?

Hillis Warren practices in Sacramento, CA, based on the location reported in the CMS Medicare provider datasets for NPI 1801999602.

How much does Medicare pay Hillis Warren?

Hillis Warren (NPI 1801999602) received approximately $20K in total Medicare Part B payments, serving 132 beneficiaries, per the CMS Medicare Physician & Other Practitioners dataset.

PROVIDER PROFILE · NPI 1801999602

Hillis WarrenM.D.

OphthalmologySacramento, CAI

MEDICARE UTILIZATION · PART B · 2024

Total beneficiaries

128

Unique beneficiaries

—

Total services

132

Distinct HCPCS

Medicare payment

$18K

Peer benchmark

Total Medicare services vs. 2,144 Ophthalmology providers in CA — bottom quintile (cohort median 1,859).

PRESCRIBING · PART D · 2024

No data available for this provider in 2024.

QUALITY · MIPS · 2024

No data available for this provider in 2024.

INDUSTRY PAYMENTS · OPEN PAYMENTS · 2025

No data available for this provider in 2025.

REFERRAL NETWORK

Where Hillis Warren's patients come from & go

Directional shared-patient flow from Medicare claims — who sends patients to this provider (inbound) and where this provider's patients go next (outbound). 6 inbound referrers · 0 outbound destinations.

Receives referrals from

Inbound — who sends patients here

Physician	Patients	Visits
DIGNITY HEALTH	53	132
Robert Equi Ophthalmology · Sacramento, CA	45	85
LEWIS, RICHARD	14	18
Joel Pearlman Ophthalmology · Sacramento, CA	12	21
David Lehman Internal Medicine · Sacramento, CA	11	18
KWOK, MONICE	11	41

Refers patients to

Outbound — where patients go next

No outbound pairs above the suppression threshold.

Source: CMS Physician Shared Patient Patterns (30-day window, Medicare FFS). Direction = a beneficiary seen by the first provider, then the second, within 30 days; a proxy for referral, not a documented referral. Pairs with fewer than 11 shared beneficiaries are suppressed.

CROSS-REFERENCE

Related data on other Healthparse brands

ProviderScore

OIG/SAM exclusion screening, sanctions history

Healthparse Signals

Monitor this provider for changes — dated NPI change events