Keith Warren, MD
NPI 1164493854 · Sleep Medicine (Internal Medicine) Physician · Winfield, IL
Enrolled with Medicare as Order and Referring Only - Sleep Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Keith Warren, MD is a Sleep Medicine (Internal Medicine) Physician provider in Winfield, IL (NPI 1164493854).
Provider details
- NPI number
- 1164493854
- Entity type
- Individual
- Primary specialty
- Sleep Medicine (Internal Medicine) PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- 42-0010962 (VT)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
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
Mailing address
Registry dates
- Enumerated
- 2006-01-30
- Last updated
- 2015-04-15
Frequently asked questions
- What is Keith Warren's NPI number?
- Keith Warren's National Provider Identifier (NPI) is 1164493854, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Keith Warren's specialty?
- Keith Warren is listed in the NPPES registry with a primary specialty of Sleep Medicine (Internal Medicine) Physician (Allopathic & Osteopathic Physicians).
- Where is Keith Warren located?
- Keith Warren's practice location on file with NPPES is 25 N Winfield Rd, Winfield, IL 60007-3361.
- What is Keith Warren's phone number?
- The practice phone number listed in the NPPES registry for Keith Warren is (630) 690-4993.
- Does Keith Warren accept Medicare?
- Keith Warren is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Keith Warren's NPI active?
- Yes — Keith Warren's NPI (1164493854) is active in the NPPES registry as of the last update on 2015-04-15.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.