Mark Sontag, MD
NPI 1891854568 · Physical Medicine & Rehabilitation Physician · Redwood City, CA
Mark Sontag, MD is a Physical Medicine & Rehabilitation Physician provider in Redwood City, CA (NPI 1891854568).
Provider details
- NPI number
- 1891854568
- Entity type
- Individual
- Primary specialty
- Physical Medicine & Rehabilitation PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- Yes
- License
- G052976 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure33% of score
19 yrs in NPPES registry
- Profile completeness33% of score
100% of core fields populated
- Practice footprint20% of score
1 documented practice location
- Open Payments transparency13% of score
Has Open Payments disclosures (2024)
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.
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$114 across 5 records (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-12-08
- Last updated
- 2009-05-28
Frequently asked questions
- What is Mark Sontag's NPI number?
- Mark Sontag's National Provider Identifier (NPI) is 1891854568, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mark Sontag's specialty?
- Mark Sontag is listed in the NPPES registry with a primary specialty of Physical Medicine & Rehabilitation Physician (Allopathic & Osteopathic Physicians).
- Where is Mark Sontag located?
- Mark Sontag's practice location on file with NPPES is 363 Main St, Redwood City, CA 94063-1729.
- What is Mark Sontag's phone number?
- The practice phone number listed in the NPPES registry for Mark Sontag is (650) 306-9490.
- Is Mark Sontag's NPI active?
- Yes — Mark Sontag's NPI (1891854568) is active in the NPPES registry as of the last update on 2009-05-28.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.