What is Karl Sporer's NPI number?

Karl Sporer's National Provider Identifier (NPI) is 1235170978, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.

What is Karl Sporer's specialty?

Karl Sporer is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).

Where is Karl Sporer located?

Karl Sporer's practice location on file with NPPES is 1001 Potrero Avenue, San Francisco, CA 94110-3518.

What is Karl Sporer's phone number?

The practice phone number listed in the NPPES registry for Karl Sporer is (415) 206-5753.

Is Karl Sporer's NPI active?

Yes — Karl Sporer's NPI (1235170978) is active in the NPPES registry as of the last update on 2025-09-11.

IndividualActive

Karl Sporer, MD

NPI 1235170978 · Internal Medicine Physician · San Francisco, CA

Karl Sporer, MD is a Internal Medicine Physician provider in San Francisco, CA (NPI 1235170978).

Provider details

NPI number: 1235170978
Entity type: Individual
Primary specialty: Internal Medicine PhysicianAllopathic & Osteopathic Physicians
Credential: MD
Sex: Male
License: C42975 (CA)

Specialties & taxonomies

Internal Medicine PhysicianPrimary207R00000XLicense C42975 (CA)
Allopathic & Osteopathic Physicians
Emergency Medicine Physician207P00000XLicense C42975 (CA)
Allopathic & Osteopathic Physicians

Profile Score

Detailed profile(91/100 index)

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

Registry tenure38% of score
20 yrs in NPPES registry
Profile completeness38% of score
100% 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

1001 Potrero Avenue

Rm 1e21

San Francisco, CA 94110-3518

Phone: (415) 206-5753

Fax: (415) 206-5818

Street-level locationGet directions

More CA providers

Mailing address

Po Box 7464

San Francisco, CA 94120-7464

Enumerated: 2006-06-10
Last updated: 2025-09-11

Frequently asked questions

What is Karl Sporer's NPI number?: Karl Sporer's National Provider Identifier (NPI) is 1235170978, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
What is Karl Sporer's specialty?: Karl Sporer is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
Where is Karl Sporer located?: Karl Sporer's practice location on file with NPPES is 1001 Potrero Avenue, San Francisco, CA 94110-3518.
What is Karl Sporer's phone number?: The practice phone number listed in the NPPES registry for Karl Sporer is (415) 206-5753.
Is Karl Sporer's NPI active?: Yes — Karl Sporer's NPI (1235170978) is active in the NPPES registry as of the last update on 2025-09-11.

Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.