Calvin Knapp, MD
NPI 1841258019 · Otolaryngology Physician · Seattle, WA
Enrolled with Medicare as Practitioner - Otolaryngology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Calvin Knapp, MD is a Otolaryngology Physician provider in Seattle, WA (NPI 1841258019).
Provider details
- NPI number
- 1841258019
- Entity type
- Individual
- Primary specialty
- Otolaryngology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- MD00027495 (WA)
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
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
- 2006-05-03
- Last updated
- 2016-03-31
Frequently asked questions
- What is Calvin Knapp's NPI number?
- Calvin Knapp's National Provider Identifier (NPI) is 1841258019, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Calvin Knapp's specialty?
- Calvin Knapp is listed in the NPPES registry with a primary specialty of Otolaryngology Physician (Allopathic & Osteopathic Physicians).
- Where is Calvin Knapp located?
- Calvin Knapp's practice location on file with NPPES is 515 Minor Ave, Seattle, WA 98104-2133.
- What is Calvin Knapp's phone number?
- The practice phone number listed in the NPPES registry for Calvin Knapp is (206) 838-8345.
- Does Calvin Knapp accept Medicare?
- Calvin Knapp is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Calvin Knapp's NPI active?
- Yes — Calvin Knapp's NPI (1841258019) is active in the NPPES registry as of the last update on 2016-03-31.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.