John W. Witczak, DO
Orthopaedic Surgery Physician · Mission Viejo, CA
John W. Witczak, DO is an orthopaedic surgery physician with a practice address in Mission Viejo, California, and NPI 1811913825, issued on Jul 14, 2006. Check the license (California 20A4682, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- John W. Witczak
- Credential
- DO
- Primary taxonomy
- Orthopaedic Surgery Physician 207X00000X
- License number
- 20A4682 CA
Self-reported in NPPES; status is on the state search - Practice location
- 26921 Crown Valley Pkwy, Mission Viejo, CA 92691
- Phone
- (949) 348-2250
- Enumerated
- Jul 14, 2006
- Record last updated
- Jul 8, 2007 (not updated in 19 years: call before relying on the address or phone)
- Fax
- (949) 348-8904
- Entity
- Type 1 · individual
8 nearest orthopaedic surgery physician records → All 2,276 in California → Look up another NPI →
Also registered at 26921 Crown Valley Pkwy
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify John W. Witczak in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license 20A4682Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
92% fewer Medicare Part D claims than the average orthopaedic surgery physician in 2024
26 Medicare Part D claims, against an average of 346 among the 16,516 providers of this specialty who prescribed in Part D.
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.
John W. Witczak among 2,276 orthopaedic surgery physician records in California
John W. Witczak, DO is one of 2,276 orthopaedic surgery physician records with a practice address in California. 74% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 10% of them.
- NPI issued2006 · 10% of these records are older, 46% newer
- In a Medicare fileYes · 74% of these records are
- In the CMS Doctors and Clinicians fileNo · 59% of these records are
- Record last updated2007 · 66% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207X00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Orthopaedic Surgery Physician providers in California
There are 2,276 orthopaedic surgery physician records in California.
All 2,276 in California → Every provider in Mission Viejo → Orthopaedic Surgery Physician nationwide →
The 8 orthopaedic surgery physician records with the nearest ZIP codes
- Kent Adamson, MDMission Viejo, CA 926911043277312
- Michael Burdi, MDMission Viejo, CA 926911801853189
- Richard Claveria, M.D.Mission Viejo, CA 926911689637761
- Daniel Duggan, D.O.Mission Viejo, CA 926911750575437
- Stephen Gardner, M.D.Mission Viejo, CA 926911871753392
- Mark Ishimaru, MDMission Viejo, CA 926911821041161
- Michael Marandola, MDMission Viejo, CA 926911013974393
- Kent Marangi, MDMission Viejo, CA 926911477510758
Common questions
What is John W. Witczak, DO's NPI number?
John W. Witczak, DO's National Provider Identifier (NPI) is 1811913825, issued on Jul 14, 2006. An NPI identifies a provider in billing; it is not a license.
Where is John W. Witczak, DO located?
The NPPES record lists a practice address at 26921 Crown Valley Pkwy, Mission Viejo, CA, 92691. Phone: (949) 348-2250. Providers update this record themselves, so call before visiting.
How can I verify John W. Witczak, DO's license?
NPPES lists California license number 20A4682, as entered by the provider. Search the Medical Board of California at https://www.mbc.ca.gov/License-Verification/default.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does John W. Witczak, DO prescribe under Medicare Part D?
In 2024, John W. Witczak, DO had 26 Medicare Part D claims; the average among orthopaedic surgery physician prescribers was 346. 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.