Mark Baker
NPI 1538665187 · Neonatal-Perinatal Medicine Physician · Billings, MT
Enrolled with Medicare as Practitioner - Pediatric Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Mark Baker is a Neonatal-Perinatal Medicine Physician provider in Billings, MT (NPI 1538665187).
Provider details
- NPI number
- 1538665187
- Entity type
- Individual
- Primary specialty
- Neonatal-Perinatal Medicine PhysicianAllopathic & Osteopathic Physicians
- Sex
- Male
- Sole proprietor
- No
- License
- 142250 (MT)
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
8 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
2 documented practice locations
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
Additional practice locations (1)
- 1919 E Thomas RdPhoenix, AZ 85016-7710Phone: (602) 546-2923
Registry dates
- Enumerated
- 2018-04-03
- Last updated
- 2024-08-29
- Certified
- 2024-08-29
Frequently asked questions
- What is Mark Baker's NPI number?
- Mark Baker's National Provider Identifier (NPI) is 1538665187, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mark Baker's specialty?
- Mark Baker is listed in the NPPES registry with a primary specialty of Neonatal-Perinatal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Mark Baker located?
- Mark Baker's practice location on file with NPPES is 1233 N 30th St, Billings, MT 59101-0127.
- What is Mark Baker's phone number?
- The practice phone number listed in the NPPES registry for Mark Baker is (406) 237-7076.
- Does Mark Baker accept Medicare?
- Mark Baker is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Mark Baker's NPI active?
- Yes — Mark Baker's NPI (1538665187) is active in the NPPES registry as of the last update on 2024-08-29.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.