What is Greg Sierra's NPI number?

Greg Sierra's National Provider Identifier (NPI) is 1841442084, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.

What is Greg Sierra's specialty?

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

Where is Greg Sierra located?

Greg Sierra's practice location on file with NPPES is 12440 Firestone Blvd Ste 3020, Norwalk, CA 90650-9328.

What is Greg Sierra's phone number?

The practice phone number listed in the NPPES registry for Greg Sierra is (562) 864-7821.

Is Greg Sierra's NPI active?

Yes — Greg Sierra's NPI (1841442084) is active in the NPPES registry as of the last update on 2008-10-21.

IndividualActive

Greg Sierra

NPI 1841442084 · Specialist · Norwalk, CA

Greg Sierra is a Specialist provider in Norwalk, CA (NPI 1841442084).

Provider details

NPI number: 1841442084
Entity type: Individual
Primary specialty: SpecialistOther Service Providers
Sex: Male
Sole proprietor: No

Specialties & taxonomies

SpecialistPrimary174400000X
Other Service Providers

Profile Score

Detailed profile(80/100 index)

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

Registry tenure38% of score
17 yrs 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

12440 Firestone Blvd Ste 3020

Norwalk, CA 90650-9328

Phone: (562) 864-7821

Street-level locationGet directions

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Mailing address