Michael G. Klassen, MD
Orthopaedic Surgery Physician · Monterey, CA
Michael G. Klassen, MD is an orthopaedic surgery physician with a practice address in Monterey, California, and NPI 1932234952, issued on Feb 22, 2007. Check the license (California G69478, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Michael G. Klassen
- Credential
- MD
- Primary taxonomy
- Orthopaedic Surgery Physician 207X00000X
- License number
- G69478 CA
Self-reported in NPPES; status is on the state search - Practice location
- 10 Harris CT Bldg A, Monterey, CA 93940
- Phone
- (831) 643-9788
- Enumerated
- Feb 22, 2007
- Record last updated
- Jan 30, 2008 (not updated in 18 years: call before relying on the address or phone)
- Fax
- (831) 657-0161
- Medicare enrollment
- Enrolled (PECOS I20090220000233); accepts Medicare assignment
- Medical or professional school
- University Of California, Geffen School Of Medicine, 1989
- Entity
- Type 1 · individual
8 nearest orthopaedic surgery physician records → All 2,276 in California → Look up another NPI →
Also registered at 10 Harris CT Bldg A
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Mary Bilbro, FNPFamily Nurse Practitioner1295010866
- Chelsea Cates, DPTPhysical Therapist1306203203
- Scott Graham, MDOrthopaedic Surgery Physician1700801313
- Ramon Jimenez, MDOrthopaedic Surgery Physician1265574230
- Bernadette Rede, PTPhysical Therapist1689890329
Verify Michael G. Klassen in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license G69478Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
95% fewer Medicare Part D claims than the average orthopaedic surgery physician in 2024
18 Medicare Part D claims, against an average of 346 among the 16,516 providers of this specialty who prescribed in Part D. Brand-name drugs were 0% of 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
- Athena Medical Group OF The Central Coast IncSalinas, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Michael G. Klassen among 2,276 orthopaedic surgery physician records in California
Michael G. Klassen, MD 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 2007, is newer than 54% of them.
- NPI issued2007 · 54% of these records are older, 35% newer
- In a Medicare fileYes · 74% of these records are
- In the CMS Doctors and Clinicians fileYes · 59% of these records are
- Graduated1989 · median 2003 among the 1,347 with a school on file
- Record last updated2008 · 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 Monterey → Orthopaedic Surgery Physician nationwide →
The 8 orthopaedic surgery physician records with the nearest ZIP codes
- Jeffrey Carter, M.D.Monterey, CA 939401992765754
- Ronald Chaplan, M.D.Monterey, CA 939401255403531
- Christopher Clevenger, MDMonterey, CA 939401538142534
- David Crandall, DOMonterey, CA 939401932551660
- Richard Dauphine, M.D.,FACSMonterey, CA 939401467440115
- Peter Gerbino, M.D.Monterey, CA 939401437221736
- Scott Graham, MDMonterey, CA 939401700801313
- Ramon Jimenez, MDMonterey, CA 939401265574230
Common questions
What is Michael G. Klassen, MD's NPI number?
Michael G. Klassen, MD's National Provider Identifier (NPI) is 1932234952, issued on Feb 22, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Michael G. Klassen, MD located?
The NPPES record lists a practice address at 10 Harris CT Bldg A, Monterey, CA, 93940. Phone: (831) 643-9788. Providers update this record themselves, so call before visiting.
How can I verify Michael G. Klassen, MD's license?
NPPES lists California license number G69478, 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 Michael G. Klassen, MD prescribe under Medicare Part D?
In 2024, Michael G. Klassen, MD had 18 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.