Dennis Hallahan, MD
NPI 1699867010 · Radiation Oncology Physician · Saint Louis, MO
Enrolled with Medicare as Practitioner - Radiation Oncology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Dennis Hallahan, MD is a Radiation Oncology Physician provider in Saint Louis, MO (NPI 1699867010).
Provider details
- NPI number
- 1699867010
- Entity type
- Individual
- Primary specialty
- Radiation Oncology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- 2009038834 (MO)
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
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
- 2006-09-30
- Last updated
- 2025-04-17
Frequently asked questions
- What is Dennis Hallahan's NPI number?
- Dennis Hallahan's National Provider Identifier (NPI) is 1699867010, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Dennis Hallahan's specialty?
- Dennis Hallahan is listed in the NPPES registry with a primary specialty of Radiation Oncology Physician (Allopathic & Osteopathic Physicians).
- Where is Dennis Hallahan located?
- Dennis Hallahan's practice location on file with NPPES is 4921 Parkview Pl, Saint Louis, MO 63110-1032.
- What is Dennis Hallahan's phone number?
- The practice phone number listed in the NPPES registry for Dennis Hallahan is (314) 747-7236.
- Does Dennis Hallahan accept Medicare?
- Dennis Hallahan is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Dennis Hallahan's NPI active?
- Yes — Dennis Hallahan's NPI (1699867010) is active in the NPPES registry as of the last update on 2025-04-17.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.