Hillis Warren, M.D.
NPI 1801999602 · Specialist · Sacramento, CA
Enrolled with Medicare as Practitioner - Ophthalmology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Hillis Warren, M.D. is a Specialist provider in Sacramento, CA (NPI 1801999602).
Provider details
- NPI number
- 1801999602
- Entity type
- Individual
- Primary specialty
- SpecialistOther Service Providers
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- Yes
- License
- G030438 (CA)
Specialties & taxonomies
Other Service Providers
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
19 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)28% of score
132 Medicare services, 2024 (ranked within specialty)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Removal of Eye Fluid (vitreous) Between Lens and Retina67036 | 40 | $147 |
| Repair of Detached Retina With Drainage and Removal of Eye Fluid Between Lens and Retina67108 | 36 | $198 |
| Removal of Membrane of Retina67041 | 26 | $190 |
| Destruction of Eye Fluid (vitreous) Between Lens and Retina and All of Retina Using a Laser67040 | 17 | $173 |
| Removal of Membrane of Retina With Removal of Internal Limiting Membrane of Retina67042 | 13 | $190 |
Typical Medicare-allowed amounts for these services range $147–$198 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, not a price quote and not what you would be billed. Medicare Part B covers roughly an eighth of all NPIs (65+ skew); services with fewer than 11 beneficiaries are suppressed by CMS. Source: CMS Medicare Physician & Other Practitioners, by Provider & Service.
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-09-07
- Last updated
- 2017-09-11
Frequently asked questions
- What is Hillis Warren's NPI number?
- Hillis Warren's National Provider Identifier (NPI) is 1801999602, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Hillis Warren's specialty?
- Hillis Warren is listed in the NPPES registry with a primary specialty of Specialist (Other Service Providers).
- Where is Hillis Warren located?
- Hillis Warren's practice location on file with NPPES is 2620 Hurley Way, Sacramento, CA 95864-3789.
- What is Hillis Warren's phone number?
- The practice phone number listed in the NPPES registry for Hillis Warren is (916) 929-1838.
- Does Hillis Warren accept Medicare?
- Hillis Warren is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Hillis Warren's NPI active?
- Yes — Hillis Warren's NPI (1801999602) is active in the NPPES registry as of the last update on 2017-09-11.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.