Calvin Horace Knapp, MD
Dermatology Physician · Everett, WA
Calvin Horace Knapp, MD is a dermatology physician with a practice address in Everett, Washington, and NPI 1225533458, issued on Mar 29, 2018. Check the license (Washington MD61463521, as entered in NPPES) on the Washington Medical Commission; the Medicare figures below come from public CMS files.
- Name
- Calvin Horace Knapp
- Credential
- MD
- Primary taxonomy
- Dermatology Physician 207N00000X
- License number
- MD61463521 WA
Self-reported in NPPES; status is on the state search - Practice location
- 4004 Colby Ave, Everett, WA 98201
- Phone
- (425) 339-5417
- Enumerated
- Mar 29, 2018
- Record last updated
- Apr 17, 2026
- Fax
- (425) 339-5429
- Medicare enrollment
- Enrolled (PECOS I20231027001791); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest dermatology physician records → All 384 in Washington → Look up another NPI →
Also registered at 4004 Colby Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Marshall Batchelor, DDSEndodontics1457401853
- Lucy Chao, MDDermatology Physician1396136057
- Sanhwan ChenDermatopathology Physician1932165784
- Michelle Draper, ARNPNurse Practitioner1578573648
- Linda Gabourel, MDDermatology Physician1568427623
- Mary Kay Graves, N.P.Nurse Practitioner1689755977
Verify Calvin Horace Knapp in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWashington Medical Commission
Search for license MD61463521Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
22% fewer Medicare Part D claims than the average dermatology physician in 2024
618 Medicare Part D claims for 246 beneficiaries, against an average of 797 among the 12,802 providers of this specialty who prescribed in Part D. Brand-name drugs were 5% of claims.
Most prescribed
- Clobetasol Propionate108 claims
- Triamcinolone Acetonide72 claims
- Ketoconazole64 claims
- Doxycycline Hyclate43 claims
- Betamethasone Dipropionate39 claims
- Hydrocortisone37 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Bills Medicare through one group practice
- Optum Care Washington PLLCLake Stevens, WA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Calvin Horace Knapp among 384 dermatology physician records in Washington
Calvin Horace Knapp, MD is one of 384 dermatology physician records with a practice address in Washington. 82% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2018, is newer than 89% of them.
- NPI issued2018 · 89% of these records are older, 9% newer
- In a Medicare fileYes · 82% of these records are
- In the CMS Doctors and Clinicians fileYes · 72% of these records are
- Graduated2018 · median 2009 among the 275 with a school on file
- Record last updated2026 · 56% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207N00000X and a Washington practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Dermatology Physician providers in Washington
There are 384 dermatology physician records in Washington.
All 384 in Washington → Every provider in Everett → Dermatology Physician nationwide →
The 8 dermatology physician records with the nearest ZIP codes
- Lucy Chao, MDEverett, WA 982011396136057
- Linda Gabourel, MDEverett, WA 982011568427623
- Matthew MajerusEverett, WA 982011821356924
- Jane Nosal, MDEverett, WA 982011154387066
- Meredith Sheedy, M.D.Everett, WA 982011578720512
- David Smith, M.D.Everett, WA 982011538255294
- Hana Stelle, M.D.Everett, WA 982011356875835
- Zarry Tavakkol, M.D.Everett, WA 982011235394560
Common questions
What is Calvin Horace Knapp, MD's NPI number?
Calvin Horace Knapp, MD's National Provider Identifier (NPI) is 1225533458, issued on Mar 29, 2018. An NPI identifies a provider in billing; it is not a license.
Where is Calvin Horace Knapp, MD located?
The NPPES record lists a practice address at 4004 Colby Ave, Everett, WA, 98201. Phone: (425) 339-5417. Providers update this record themselves, so call before visiting.
How can I verify Calvin Horace Knapp, MD's license?
NPPES lists Washington license number MD61463521, as entered by the provider. Search the Washington Medical Commission at https://wahelms.my.site.com/s/license-search. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Calvin Horace Knapp, MD prescribe under Medicare Part D?
In 2024, Calvin Horace Knapp, MD had 618 Medicare Part D claims for 246 beneficiaries; the average among dermatology physician prescribers was 797. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.