1. Home
  2. Directory
  3. Washington
  4. Seattle
  5. Otolaryngology
  6. NPI Profile

CALVIN H KNAPP JR. MD
NPI 1841258019
Otolaryngology in Seattle, WA

Active since May 03, 2006PECOS Enrolled
515 MINOR AVE, SUITE 140, SEATTLE, WA 98104(206) 838-8345(206) 838-8346 Get Directions Write a Review

NPPES record last updated: March 31, 2016. Verified against the NPPES registry weekly; last sync: October 18, 2026.

About Calvin H Knapp Jr. Md NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

CALVIN H KNAPP JR. MD (NPI 1841258019) is an individual otolaryngology provider in Seattle, Washington, licensed in Washington (MD00027495) and active in the NPI registry since May 2006. He is enrolled in Medicare PECOS.

NPPES Registry Identity

NPI1841258019
Entity TypeIndividualMale
Primary Taxonomy207Y00000X
Provider Legal NameCALVIN H KNAPP JR.Credential: MD
Location Address515 MINOR AVE, SUITE 140Seattle, WA 98104-2133
Mailing Address805 Madison St, Suite 901Seattle, WA 98104-1172 · (206) 264-8100
Phone(206) 838-8345
Fax(206) 838-8346
Sole ProprietorNo
Enumeration DateMay 3, 2006
Last NPPES UpdateMarch 31, 2016
✔ NPI 1841258019 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyOtolaryngologyAllopathic & Osteopathic Physicians
Taxonomy Code207Y00000X
License✔ Licensed in WA · MD00027495
Definition
An otolaryngologist-head and neck surgeon provides comprehensive medical and surgical care for patients with diseases and disorders that affect the ears, nose, throat, the respiratory and upper alimentary systems and related structures of the head and neck. An otolaryngologist diagnoses and provides medical and/or surgical therapy or prevention of diseases, allergies, neoplasms, deformities, disorders and/or injuries of the ears, nose, sinuses, throat, respiratory and upper alimentary systems, face, jaws and the other head and neck systems. Head and neck oncology, facial plastic and reconstructive surgery and the treatment of disorders of hearing and voice are fundamental areas of expertise.
515 MINOR AVE, Seattle, WA 98104
Open in Google Maps ↗

Other Identifiers 3

Medicare UPIND42561WA
Medicaid1057835WA
Other0781KNWA · Regence

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Calvin H Knapp Jr. Md is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Medicare Billing Reassignment

Medicare enrollment records show Calvin Knapp reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

Proliance Surgeons, Inc., P.S.
Same address
Multi-Specialty
515 MINOR AVE STE 200
Seattle, WA 98104
  • Reassigned Medicare billing, Washington enrollment
  • 589 clinicians in this Medicare group
NPI 1346609575 (206) 386-9668

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 98104 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient
$143.76 typical visit price
range $63.67 – $189.37
Typical copayment $35.94 (range $15.91 – $47.34)
Most-billed visit code 99204
Established Patient
$78.74 typical visit price
range $21.12 – $155.00
Typical copayment $19.68 (range $5.28 – $38.75)
Most-billed visit code 99213
Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

Other Providers at the Same Location NPPES 20

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

LINDSAY NICOLE WARNER M.D.
Internal Medicine
515 MINOR AVE
SEATTLE, WA 98104
King County (206) 386-9500
DR. STEVEN HAN MD
Urology
515 MINOR AVE, SUITE 200
SEATTLE, WA 98104
King County (206) 215-2580
LESTER R SAUVAGE JR. MD
Internal Medicine
515 MINOR AVE, SUITE 300
SEATTLE, WA 98104
King County (206) 386-9500
JOHN STEELE MULLEN MD
Urology
515 MINOR AVE, SUITE 200
SEATTLE, WA 98104
King County (206) 215-2580
JODY CLEMENT DEXTER MPT
Physical Therapist
515 MINOR AVE, SUITE 22
SEATTLE, WA 98104
King County (206) 386-5600
LAUREL CHARBONNEAU DPT
Physical Therapist
515 MINOR AVE, SUITE 22
SEATTLE, WA 98104
King County (206) 386-5600
KRISTIN SZABADI PT
Physical Therapist
515 MINOR AVE, SUITE 22
SEATTLE, WA 98104
King County (425) 455-2630
MR. RODNEY GEORGE YEN DPM
Podiatrist (Foot Surgery)
515 MINOR AVE, SUITE 240
SEATTLE, WA 98104
King County (206) 386-9668

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Calvin Knapp's NPI number?

The NPI number for Calvin Knapp is 1841258019. It was assigned to this individual provider in the NPPES registry on May 3, 2006.

Where is Calvin Knapp located?

Calvin Knapp practices at 515 Minor Ave Suite 140, Seattle, WA 98104. The listed phone number is (206) 838-8345.

What is Calvin Knapp's specialty?

The primary specialty registered for this NPI is Otolaryngology with taxonomy code 207Y00000X.

Is Calvin Knapp enrolled in Medicare?

Yes. Calvin Knapp is registered in the Medicare PECOS enrollment system.

Which organization bills Medicare for Calvin Knapp's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Calvin Knapp reassigns Medicare benefits to Proliance Surgeons, Inc., P.S. (Seattle, WA). The reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Calvin Knapp's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

When was this NPI record last updated?

The NPPES record for Calvin Knapp was last updated on March 31, 2016. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 10 years ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.