Quick answers
- Where does Calvin H. Knapp see patients?
- Medicare's clinician data lists 1 practice location in Lake Stevens, WA. Call before your visit to confirm the address.
- What is Calvin H. Knapp's specialty?
- Medicare lists Dermatology as the primary specialty.
- Does Calvin H. Knapp accept Medicare assignment?
- Yes. Medicare's clinician data says Calvin H. Knapp accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of 2026-10-02. Ask the office to confirm before your visit.
- What is the phone number for Calvin H. Knapp?
- (425) 397-1700, as listed in official Medicare / NPI Registry data.
- What is Calvin H. Knapp's NPI number?
- 1225533458. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Practice locations
Addresses where Calvin H. Knapp is enrolled with Medicare (CMS data updated 2026-10-02).
- 8910 Vernon RdLake Stevens, WA 98258 (425) 397‑1700
Group practices
Medicare enrollment lists Calvin H. Knapp as a member of this group (CMS data updated 2026-10-02).
- Optum Care Washington PLLC683 clinicians in the group
Specialties
- Dermatologyprimary
Other dermatologists in Washington
Clinicians with the same Medicare primary specialty in Washington — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 2018 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1225533458 |
| Corrections | Report an error or suggest an update → |
Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.
Sources
- National Downloadable File (Doctors and Clinicians) — CMS, data updated 2026-10-02, retrieved 2026-10-29
- NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
- Medicare Care Compare — official Medicare tool to look up clinicians