Carl Mason, M.D.
NPI 1184787525 · Internal Medicine Physician · Seattle, WA
Carl Mason, M.D. is a Internal Medicine Physician provider in Seattle, WA (NPI 1184787525).
Provider details
- NPI number
- 1184787525
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- MD038142E (PA)
Specialties & taxonomies
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
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
- 2006-12-18
- Last updated
- 2014-09-25
Frequently asked questions
- What is Carl Mason's NPI number?
- Carl Mason's National Provider Identifier (NPI) is 1184787525, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Carl Mason's specialty?
- Carl Mason is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Carl Mason located?
- Carl Mason's practice location on file with NPPES is 24 Roy St, Seattle, WA 98109-4018.
- What is Carl Mason's phone number?
- The practice phone number listed in the NPPES registry for Carl Mason is (805) 455-8593.
- Is Carl Mason's NPI active?
- Yes — Carl Mason's NPI (1184787525) is active in the NPPES registry as of the last update on 2014-09-25.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.