Nathan Klammer, MD

Primary specialty

Emergency Medicine PhysicianTaxonomy code 207P00000X

License

42931 Issued in OK

Practice address

1145 S Utica Ave Ste 365
Tulsa, OK 74104-4004

Phone

(918) 728-3354

NPI assigned

Apr 7, 2021

Sex

Male

Sole proprietor

Yes

Registry information is reported by the provider to CMS and is not verified. About this source

Specialties & licenses 1

Addresses

Medicare fee-for-service enrollment

Enrolled in AR, OK, TX3 enrollments

Eligible to order & refer

• Part B services: Yes
• Medical equipment: Yes
• Home health: Yes
• Power mobility devices: Yes
• Hospice: Yes

Green means eligible to order or refer.

Enrollment records 3

Specialty

Emergency Medicine

Education

University of Arkansas College of Medicine, 2021

Medicare assignment

Accepts the Medicare-approved amount as payment in full

Group practices

Creek Nation Hospital and Clinics 364 clinicians

Green Country Emergency Physicians Group of Tulsa, PLLC 107 clinicians

Practice addresses (Care Compare)

Hospital & facility affiliations

• Hillcrest Hospital South Hospital, Tulsa, OK, CCN 370202
• Hillcrest Hospital Claremore Hospital, Claremore, OK, CCN 370039
• Hillcrest Hospital Pryor Hospital, Pryor, OK, CCN 370015
• Bailey Medical Center, LLC Hospital, Owasso, OK, CCN 370228
• Eastern Oklahoma Medical Center Hospital, Poteau, OK, CCN 371337

Merit-based Incentive Payment System (MIPS)

Final score

95.83 of 100Reported as group

Quality

81.24

Promoting interoperability

100

Improvement activities

40

Merit-based Incentive Payment System (MIPS)

Final score

85.12 of 100Reported as group

Quality

83.76

Promoting interoperability

100

Improvement activities

40

Cost

56.64

Medicare enrollment (NPD)

Enrolled

Credentials

Doctor of Medicine

State licenses

Practice roles

Locations

Interoperability endpoints

• FHIR API: https://epicproxy.ardenthealth.com/fhir/BMC/api/FHIR/R4
• Direct secure messaging: nklammer1133792@ahs.direct-ci.com

Organizations this provider is connected to: Medicare benefit reassignments (the organization bills Medicare for this provider’s services), Care Compare group memberships and National Provider Directory roles.

• Creek Nation Hospital & Clinics

  • Clinic/Center
  • Muskogee, OK
  • NPI 1366593923

  OK, Single Specialty

  Medicare reassignment Care Compare group NPD
• Creek Nation Hospital & Clinics

  • Family Medicine Physician
  • Okemah, OK
  • NPI 1467053173

  Single Specialty, TX

  Medicare reassignment Care Compare group NPD
• Green Country Emergency Physicians Group of Tulsa PLLC

  • Emergency Medicine Physician
  • Tulsa, OK
  • NPI 1972698553

  OK, Single Specialty

  Medicare reassignment Care Compare group NPD
• Monticello Ess LLC

  • Emergency Medicine Physician
  • Monticello, AR
  • NPI 1184010753

  AR, Single Specialty

  Medicare reassignment NPD
• Unity Health - Newport

  • Surgery Physician
  • Newport, AR
  • NPI 1538808225

  AR, Single Specialty

  Medicare reassignment NPD
• Creek Nation Hospital & Clinics

  • Pharmacy
  • Okemah, OK
  • NPI 1033229992
  Care Compare group
• Creek Nation Hospital & Clinics

  • Ambulatory Surgical Clinic/Center
  • Okemah, OK
  • NPI 1104516871
  Care Compare group
• Creek Nation Hospital & Clinics

  • Pharmacy
  • Okmulgee, OK
  • NPI 1154430031
  Care Compare group
• Creek Nation Hospital & Clinics

  • Indian Health Service/Tribal/Urban Indian Health (I/T/U) Pharmacy
  • Tulsa, OK
  • NPI 1265004667
  Care Compare group
• Creek Nation Hospital & Clinics

  • Medicare Defined Swing Bed Hospital Unit
  • Okmulgee, OK
  • NPI 1376972471
  Care Compare group
• Creek Nation Hospital & Clinics

  • Long Term Care Hospital
  • Okmulgee, OK
  • NPI 1376979955
  Care Compare group
• Creek Nation Hospital & Clinics

  • Indian Health Service/Tribal/Urban Indian Health (I/T/U) Pharmacy
  • Wetumka, OK
  • NPI 1407116668
  Care Compare group

Hospitals and other facilities this clinician is affiliated with according to Medicare Care Compare.

• Ahs Claremore Regional Hospital, LLC.

  • General Acute Care Hospital
  • Claremore, OK
  • NPI 1023398807

  Hospital

  Care Compare affiliation
• Ahs Pryor Hospital, LLC

  • General Acute Care Hospital
  • Pryor, OK
  • NPI 1780125005

  Hospital

  Care Compare affiliation
• Ahs Southcrest Hospital, LLC

  • General Acute Care Hospital
  • Tulsa, OK
  • NPI 1750661534

  Hospital

  Care Compare affiliation
• Bailey Medical Center, LLC

  • General Acute Care Hospital
  • Owasso, OK
  • NPI 1205846037

  Hospital

  Care Compare affiliation
• Leflore County Hospital Authority

  • Psychiatric Hospital Unit
  • Poteau, OK
  • NPI 1184997447

  Hospital

  Care Compare affiliation
• Leflore County Hospital Authority

  • Critical Access Hospital
  • Poteau, OK
  • NPI 1396767158

  Hospital

  Care Compare affiliation

The complete NPPES record for this NPI in the NPI Registry API format.

{
    "created_epoch": "1617753600000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1744156800000",
    "number": "1104405869",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "1145 S UTICA AVE STE 365",
            "city": "TULSA",
            "state": "OK",
            "postal_code": "741044004"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "1145 S UTICA AVE STE 365",
            "city": "TULSA",
            "state": "OK",
            "postal_code": "741044004",
            "telephone_number": "918-728-3354"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "KLAMMER",
        "first_name": "NATHAN",
        "credential": "MD",
        "sole_proprietor": "YES",
        "sex": "M",
        "enumeration_date": "2021-04-07",
        "last_updated": "2025-04-09",
        "certification_date": "2025-04-09",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "207P00000X",
            "taxonomy_group": "193400000X SINGLE SPECIALTY  GROUP",
            "desc": "Emergency Medicine",
            "state": "OK",
            "license": "42931",
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

• Kerry Kerr Kitterman, DDS
• Mia Nicole Kitterman
• Jordan Kizer
• Kla Consulting LLC
• Michele K Klahr, L.P.C.
• Haley Klassen
• Kedrick Klassen
• Jayson Richardson Jon Jon Klausen, BS BA CMD
• Emily Corinn Kleck, OTR
• Christopher John Klein, PHD

• All providers in Tulsa, OK
• Emergency Medicine Physician in Oklahoma

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Apr 9, 2025; self-reported and not verified by CMS. Specialty names from the NUCC taxonomy.
• Medicare enrollment (CMS PECOS): enrollments, PAC IDs and benefit reassignments; Order and Referring.
• Medicare Care Compare (CMS): clinician profile, group practices, facility affiliations, MIPS scores and star ratings.
• National Provider Directory (CMS): practice roles, locations, licenses, networks and endpoints.

Verify at the official NPI Registry.