Marin Underhill
NPI 1114897527 · Physician Assistant · Billings, MT
Enrolled with Medicare as Practitioner - Physician Assistant · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Marin Underhill is a Physician Assistant provider in Billings, MT (NPI 1114897527).
Provider details
- NPI number
- 1114897527
- Entity type
- Individual
- Primary specialty
- Physician AssistantPhysician Assistants & Advanced Practice Nursing Providers
- Sex
- Female
- Sole proprietor
- No
Specialties & taxonomies
Physician Assistants & Advanced Practice Nursing Providers
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
Under 1 yr in registry
- Profile completeness38% of score
83% 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
- 2025-11-10
- Last updated
- 2025-11-10
- Certified
- 2025-11-10
Frequently asked questions
- What is Marin Underhill's NPI number?
- Marin Underhill's National Provider Identifier (NPI) is 1114897527, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Marin Underhill's specialty?
- Marin Underhill is listed in the NPPES registry with a primary specialty of Physician Assistant (Physician Assistants & Advanced Practice Nursing Providers).
- Where is Marin Underhill located?
- Marin Underhill's practice location on file with NPPES is 801 N 29th St, Billings, MT 59101-0905.
- What is Marin Underhill's phone number?
- The practice phone number listed in the NPPES registry for Marin Underhill is (406) 238-2500.
- Does Marin Underhill accept Medicare?
- Marin Underhill is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Marin Underhill's NPI active?
- Yes — Marin Underhill's NPI (1114897527) is active in the NPPES registry as of the last update on 2025-11-10.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.