Allen Sonstein, MD
NPI 1831194489 · Internal Medicine Physician · Austin, TX
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Allen Sonstein, MD is a Internal Medicine Physician provider in Austin, TX (NPI 1831194489).
Provider details
- NPI number
- 1831194489
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- E3462 (TX)
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
21 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
- 2005-06-19
- Last updated
- 2014-01-20
Frequently asked questions
- What is Allen Sonstein's NPI number?
- Allen Sonstein's National Provider Identifier (NPI) is 1831194489, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Allen Sonstein's specialty?
- Allen Sonstein is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Allen Sonstein located?
- Allen Sonstein's practice location on file with NPPES is 7201 Manchaca Rd, Austin, TX 78745-5259.
- What is Allen Sonstein's phone number?
- The practice phone number listed in the NPPES registry for Allen Sonstein is (512) 443-3577.
- Does Allen Sonstein accept Medicare?
- Allen Sonstein is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Allen Sonstein's NPI active?
- Yes — Allen Sonstein's NPI (1831194489) is active in the NPPES registry as of the last update on 2014-01-20.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.