Mark J Sontag MD
NPI 1639239528 · Pain Medicine (Physical Medicine & Rehabilitation) Physician · Redwood City, CA
Mark J Sontag MD is a Pain Medicine (Physical Medicine & Rehabilitation) Physician organization in Redwood City, CA (NPI 1639239528).
Provider details
- NPI number
- 1639239528
- Entity type
- Organization
- Primary specialty
- Pain Medicine (Physical Medicine & Rehabilitation) PhysicianAllopathic & Osteopathic Physicians
- Organization subpart
- No
- Authorized official
- Mark Sontag, Owner(650) 306-9490
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
19 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
Mailing address
Registry dates
- Enumerated
- 2006-12-11
- Last updated
- 2008-02-01
Frequently asked questions
- What is Mark J Sontag MD's NPI number?
- Mark J Sontag MD's National Provider Identifier (NPI) is 1639239528, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What type of organization is Mark J Sontag MD?
- Mark J Sontag MD is classified in the NPPES registry as Pain Medicine (Physical Medicine & Rehabilitation) Physician (Allopathic & Osteopathic Physicians).
- Where is Mark J Sontag MD located?
- Mark J Sontag MD's practice location on file with NPPES is 363 Main Street, Redwood City, CA 94063.
- What is Mark J Sontag MD's phone number?
- The practice phone number listed in the NPPES registry for Mark J Sontag MD is (650) 306-9490.
- Who is the authorized official for Mark J Sontag MD?
- The authorized official listed on Mark J Sontag MD's NPPES record is Mark Sontag, Owner. The authorized official registers and maintains the organization's NPI and is not necessarily its owner.
- Is Mark J Sontag MD's NPI active?
- Yes — Mark J Sontag MD's NPI (1639239528) is active in the NPPES registry as of the last update on 2008-02-01.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.