Walter Ray Klassen, MD
Family Medicine Physician · Woodward, OK
Walter Ray Klassen, MD is a family medicine physician with a practice address in Woodward, Oklahoma, and NPI 1326180084, issued on Feb 12, 2007. Check the license (Oklahoma 23902, as entered in NPPES) on the Oklahoma Board of Medical Licensure and Supervision; the Medicare figures below come from public CMS files.
- Name
- Walter Ray Klassen
- Credential
- MD
- Primary taxonomy
- Family Medicine Physician 207Q00000X
- License number
- 23902 OK
Self-reported in NPPES; status is on the state search - Practice location
- 1024 Main St, Woodward, OK 73801
- Phone
- (580) 254-5353
- Enumerated
- Feb 12, 2007
- Record last updated
- Aug 4, 2011 (not updated in 15 years: call before relying on the address or phone)
- Fax
- (580) 254-5354
- Medicare enrollment
- Enrolled (PECOS I20090727000657); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest family medicine physician records → All 2,303 in Oklahoma → Look up another NPI →
Verify Walter Ray Klassen in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersOklahoma Board of Medical Licensure and Supervision
Search for license 23902Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
87% more Medicare Part D claims than the average family medicine physician in 2024
6,613 Medicare Part D claims for 267 beneficiaries, against an average of 3,544 among the 117,163 providers of this specialty who prescribed in Part D. Brand-name drugs were 13% of claims. 121 claims were for opioids.
Most prescribed
- Levothyroxine Sodium427 claims
- Lisinopril343 claims
- Gabapentin334 claims
- Amlodipine Besylate271 claims
- Simvastatin260 claims
- Atorvastatin Calcium245 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.
The MIPS final score for 2023 (Medicare payment program): 71.1 of 100
The Merit-based Incentive Payment System score is reported for this clinician. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023; category weights for 2023 (qpp.cms.gov).
Industry payments in 2024: $208.07
10 payments; by number, the most common kind was food and beverage; the largest payer was Exact Sciences Corporation. The 55,478 providers of this specialty with any payment received $902.55 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Walter Ray Klassen among 2,303 family medicine physician records in Oklahoma
Walter Ray Klassen, MD is one of 2,303 family medicine physician records with a practice address in Oklahoma. 79% 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 47% of them.
- NPI issued2007 · 47% of these records are older, 46% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileYes · 61% of these records are
- Graduated2006 · median 2008 among the 1,407 with a school on file
- Record last updated2011 · 60% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207Q00000X and a Oklahoma practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
6 family medicine physician records list a practice address in Woodward
They are 6 of the 394 NPPES records with a practice address in Woodward, and 2,303 family medicine physician records in Oklahoma.
All 2,303 in Oklahoma → Every provider in Woodward → Family Medicine Physician nationwide →
The 8 family medicine physician records with the nearest ZIP codes
- Richard Brown, M.D.Woodward, OK 738011083766174
- Jamie Gore, D.O.Woodward, OK 738011730113788
- Guila Hall, MDWoodward, OK 738011932514429
- Kenan Kirkendall, D.O.Woodward, OK 738011316949563
- Kathryn Ray, MDWoodward, OK 738011477648517
- James Garner, M.D.Watonga, OK 737721598757510
- Robert Spencer, MDWatonga, OK 737721639180318
- Kirt Bierig, D.O.Okeene, OK 737631316979768
Common questions
What is Walter Ray Klassen, MD's NPI number?
Walter Ray Klassen, MD's National Provider Identifier (NPI) is 1326180084, issued on Feb 12, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Walter Ray Klassen, MD located?
The NPPES record lists a practice address at 1024 Main St, Woodward, OK, 73801. Phone: (580) 254-5353. Providers update this record themselves, so call before visiting.
How can I verify Walter Ray Klassen, MD's license?
NPPES lists Oklahoma license number 23902, as entered by the provider. Search the Oklahoma Board of Medical Licensure and Supervision at https://www.okmedicalboard.org/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Walter Ray Klassen, MD prescribe under Medicare Part D?
In 2024, Walter Ray Klassen, MD had 6,613 Medicare Part D claims for 267 beneficiaries; the average among family medicine physician prescribers was 3,544. Part D covers Medicare prescriptions only.
What is Walter Ray Klassen, MD's MIPS final score?
The 2023 MIPS final score is 71.1 of 100. The average among 454,083 clinicians with a measured score was 83.5.
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.