Ann Warren, MD
NPI 1902993603 · Specialist · Barrington, IL
Enrolled with Medicare as Practitioner - Obstetrics/Gynecology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Ann Warren, MD is a Specialist provider in Barrington, IL (NPI 1902993603).
Provider details
- NPI number
- 1902993603
- Entity type
- Individual
- Primary specialty
- SpecialistOther Service Providers
- Credential
- MD
- Sex
- Female
- Sole proprietor
- No
- License
- 036075414 (IL)
Specialties & taxonomies
Other Service Providers
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
- 2006-10-06
- Last updated
- 2011-10-20
Frequently asked questions
- What is Ann Warren's NPI number?
- Ann Warren's National Provider Identifier (NPI) is 1902993603, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Ann Warren's specialty?
- Ann Warren is listed in the NPPES registry with a primary specialty of Specialist (Other Service Providers).
- Where is Ann Warren located?
- Ann Warren's practice location on file with NPPES is 27790 W Il Route 22 Ste 32, Barrington, IL 60010-2396.
- What is Ann Warren's phone number?
- The practice phone number listed in the NPPES registry for Ann Warren is (847) 381-8181.
- Does Ann Warren accept Medicare?
- Ann Warren is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Ann Warren's NPI active?
- Yes — Ann Warren's NPI (1902993603) is active in the NPPES registry as of the last update on 2011-10-20.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.