Nathan Klammer, MD
Emergency Medicine Physician · Tulsa, OK
Nathan Klammer, MD is an emergency medicine physician with a practice address in Tulsa, Oklahoma, and NPI 1104405869, issued on Apr 7, 2021. Check the license (Oklahoma 42931, as entered in NPPES) on the Oklahoma Board of Medical Licensure and Supervision; the Medicare figures below come from public CMS files.
- Name
- Nathan Klammer
- Credential
- MD
- Primary taxonomy
- Emergency Medicine Physician 207P00000X
- License number
- 42931 OK
Self-reported in NPPES; status is on the state search - Practice location
- 1145 S Utica Ave Ste 365, Tulsa, OK 74104
- Phone
- (918) 728-3354
- Enumerated
- Apr 7, 2021
- Record last updated
- Apr 9, 2025
- Medicare enrollment
- Enrolled (PECOS I20240705001021); accepts Medicare assignment
- Medical or professional school
- University Of Arkansas College Of Medicine, 2021
- Entity
- Type 1 · individual
8 nearest emergency medicine physician records → All 748 in Oklahoma → Look up another NPI →
Also registered at 1145 S Utica Ave Ste 365
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Yeganeh Azimi, PACEmergency Medical Services (Emergency Medicine) Physician1063289247
- Malyke Bray, PA-CPhysician Assistant1245909878
- Lauren Crispino, DOEmergency Medicine Physician1497331813
- Seagal Dauglas, MDEmergency Medicine Physician1477016467
- Trever Engler, APRNFamily Nurse Practitioner1407680119
- Kelsey GonzalesPhysician Assistant1912558271
Verify Nathan Klammer 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 42931Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
24% fewer Medicare Part D claims than the average emergency medicine physician in 2024
172 Medicare Part D claims for 128 beneficiaries, against an average of 226 among the 54,106 providers of this specialty who prescribed in Part D. 28 claims were for opioids.
Most prescribed
- Cephalexin28 claims
- Hydrocodone-Acetaminophen23 claims
- Prednisone18 claims
- Amoxicillin-Clavulanate Potass11 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 2 group practices
- Creek Nation Hospital And ClinicsTulsa, OK
- Green Country Emergency Physicians Group OF Tulsa, PLLCPryor, OK
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Nathan Klammer among 748 emergency medicine physician records in Oklahoma
Nathan Klammer, MD is one of 748 emergency medicine physician records with a practice address in Oklahoma. 87% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2021, is newer than 83% of them.
- NPI issued2021 · 83% of these records are older, 9% newer
- In a Medicare fileYes · 87% of these records are
- In the CMS Doctors and Clinicians fileYes · 59% of these records are
- Graduated2021 · median 2016 among the 438 with a school on file
- Record last updated2025 · 53% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207P00000X and a Oklahoma practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
264 emergency medicine physician records list a practice address in Tulsa
They are 264 of the 18,643 NPPES records with a practice address in Tulsa, and 748 emergency medicine physician records in Oklahoma.
All 748 in Oklahoma → Every provider in Tulsa → Emergency Medicine Physician nationwide →
The 8 emergency medicine physician records with the nearest ZIP codes
- Jerry Castleberry, DOTulsa, OK 741041417919762
- Jeffrey Dixon, MDTulsa, OK 741041669463865
- Charles Farmer, M.D.Tulsa, OK 741041326078726
- Jeffrey Goodloe, M.D.Tulsa, OK 741041285610428
- William Gray, MDTulsa, OK 741041891786000
- Todd Hoffman, MDTulsa, OK 741041821089020
- Joe Huddleston, DOTulsa, OK 741041447241641
- Stephen Jaskowiak, D.O.Tulsa, OK 741041235169632
Common questions
What is Nathan Klammer, MD's NPI number?
Nathan Klammer, MD's National Provider Identifier (NPI) is 1104405869, issued on Apr 7, 2021. An NPI identifies a provider in billing; it is not a license.
Where is Nathan Klammer, MD located?
The NPPES record lists a practice address at 1145 S Utica Ave Ste 365, Tulsa, OK, 74104. Phone: (918) 728-3354. Providers update this record themselves, so call before visiting.
How can I verify Nathan Klammer, MD's license?
NPPES lists Oklahoma license number 42931, 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 Nathan Klammer, MD prescribe under Medicare Part D?
In 2024, Nathan Klammer, MD had 172 Medicare Part D claims for 128 beneficiaries; the average among emergency medicine physician prescribers was 226. 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.