What is Frank Sierra's NPI number?

Frank Sierra's National Provider Identifier (NPI) is 1588550818, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.

What is Frank Sierra's specialty?

Frank Sierra is listed in the NPPES registry with a primary specialty of Specialist (Other Service Providers).

Where is Frank Sierra located?

Frank Sierra's practice location on file with NPPES is 4610 X St, Sacramento, CA 95817-2200.

What is Frank Sierra's phone number?

The practice phone number listed in the NPPES registry for Frank Sierra is (925) 698-8052.

Is Frank Sierra's NPI active?

Yes — Frank Sierra's NPI (1588550818) is active in the NPPES registry as of the last update on 2025-06-13.

IndividualActive

Frank Sierra

NPI 1588550818 · Specialist · Sacramento, CA

Frank Sierra is a Specialist provider in Sacramento, CA (NPI 1588550818).

Provider details

NPI number: 1588550818
Entity type: Individual
Primary specialty: SpecialistOther Service Providers
Sex: Male
Sole proprietor: No

Specialties & taxonomies

SpecialistPrimary174400000X
Other Service Providers

Profile Score

Basic profile(48/100 index)

A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.

Registry tenure38% of score
1 yr in NPPES registry
Profile completeness38% of score
83% of core fields populated
Practice footprint23% of score
1 documented practice location

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.

Practice location

4610 X St

Sacramento, CA 95817-2200

Phone: (925) 698-8052

Street-level locationGet directions

More CA providers

Mailing address