Independent US Healthcare Provider Directory & Public Medical Database Patient Guides

Dr. Benjamin Houston Greiner , DO, MPH

Internal Medicine โ€ข Tulsa, OK

Active NPI 1902428212 Individual Practitioner Male Practitioner Accepts Medicare assignment Telehealth (some services)
Practice location in NPPES

6600 S Yale Ave Ste 600
Tulsa, OK 741363363

Call 9184915990 Location details and other listings
Medical Disclaimer

This profile restates public CMS/NPPES data; T-MedInfo gives no medical advice — consult a licensed professional, and call 911 for emergencies.

Practice Location & Contact Primary Location

Practice Address

6600 S Yale Ave Ste 600

Tulsa, OK 741363363

Telephone 9184915990
Fax 9184886673
Organization at the Same NPPES Address or Phone
Warren Clinic Inc Facility NPI 1437866910

Matched by practice address or phone in NPPES. A shared address or phone does not confirm that this clinician works there.

Other Listings in Public Data

CMS Doctors and Clinicians lists 1 group name: Warren Clinic Inc. See the list

Source: CMS Doctors and Clinicians National Downloadable File, release date unavailable.

Listings do not confirm current availability, employment or a shared ownership network.

Medicare Profile & Education

Source: CMS Doctors and Clinicians National Downloadable File

Medical School

Oklahoma State University College Of Osteopathic Medicine

Graduation Year

2020

Medicare patients

524 people with Original Medicare in 2024

Different Original Medicare patients in 2024; counts below 11 are hidden; this does not show availability or quality.

Source: CMS, Medicare Physician & Other Practitioners โ€“ by Provider, 2024.

Medicare-allowed amount

About $125,665 in 2024

The total amount Medicare approved for these services in 2024. It includes what Medicare paid and what patients or their other insurance owed, such as the deductible and coinsurance.

What this does not show: Medicare-allowed amount

This is not the clinician's income. Part of it can go to a clinic or group practice, staff, equipment or drugs. It is not the price you will pay.

Source: CMS, Medicare Physician & Other Practitioners โ€“ by Provider and Service, 2024.

Paid by Medicare

About $86,708 in 2024

The part of the Medicare-allowed amount that Medicare itself paid in 2024, after patients' deductibles and coinsurance.

What this does not show: Paid by Medicare

This is not the clinician's income and not a measure of quality.

Source: CMS, Medicare Physician & Other Practitioners โ€“ by Provider and Service, 2024.

30-day fills

20,881 standardized 30-day fills in 2024

CMS converts prescriptions to 30-day supplies so they can be compared. A 90-day prescription counts as about three 30-day fills.

What this does not show: 30-day fills

It is not a count of patients and not a measure of quality.

Part D drug cost

$956,129 in 2024

The total cost of these prescriptions in 2024, paid by Medicare drug plans, patients and other payers together.

What this does not show: Part D drug cost

A higher cost often reflects the type of medicines a specialty uses. It is not your out-of-pocket cost and not a measure of quality.

Source: CMS, Medicare Part D Prescribers โ€“ by Provider and Drug, 2024.

Open Payments general payments, program year 2025

All general payments: $1,152.04 across 62 records.

By nature of payment

  • Food and Beverage: $1,152.04 across 62 records.

Reporting-company totals (3 largest of 22)

  • Pfizer Inc.: $158.13 across 8 records.
  • GlaxoSmithKline, LLC.: $145.24 across 10 records.
  • AstraZeneca Pharmaceuticals LP: $139.10 across 6 records.

A reported payment does not necessarily mean the financial relationship is improper and is not a measure of care quality. Clinicians can review and dispute these records.

See the full table

Source: Calculated by T-MedInfo from CMS Open Payments general-payment records for program year 2025 (published June 30, 2026).

Guide: How to read an Open Payments record

Years since graduation

6 years (graduated 2020)

CMS Doctors and Clinicians data list 2020 as the year this clinician finished professional school.

What this does not show: Years since graduation

It is not the number of years in practice, and more years does not mean better care.

Source: CMS Doctors and Clinicians National Downloadable File.

NPI first issued

2020

The year this clinician's National Provider Identifier (NPI) was issued. An NPI is a unique 10-digit ID that US health care providers use for billing.

What this does not show: NPI first issued

NPIs have been issued only since 2005, so this year is not necessarily when the clinician started practicing.

Source: CMS NPPES NPI Registry.

Accepts Medicare assignment

CMS data list this clinician as accepting Medicare assignment. This means agreeing to take the Medicare-approved amount as full payment for covered services.

Medicare assignment applies to Original Medicare. It does not tell you whether the clinician is in a Medicare Advantage plan's network, accepts other insurance, or is taking new patients.

Source: CMS Doctors and Clinicians; Medicare.gov, โ€œDoes your provider accept Medicare as full payment?โ€

Guide: What Medicare assignment means

Telehealth (some services)

Recent Medicare claims show this clinician provided some services by telehealth, such as a video or phone visit.

What this does not show: Telehealth (some services)

It does not mean all services are offered by telehealth, or that telehealth is covered by your plan.

Source: CMS, Telehealth Indicator on Medicare Care Compare (fact sheet, January 2023); CMS Doctors and Clinicians.

Guide: How Medicare covers telehealth

Enrolled in Medicare (PECOS)

Dr. Greiner has a Medicare enrollment record in PECOS, the CMS system clinicians use to enroll so they can bill Medicare or order services for people with Medicare.

It does not show whether the clinician accepts assignment, is in your plan's network, or is taking new patients.

Source: CMS Medicare Fee-For-Service Public Provider Enrollment (PECOS); CMS Order and Referring file.

Guide: What Medicare enrollment (PECOS) means

Can order Medicare-covered services

CMS lists Dr. Greiner as eligible to order or refer Medicare Part B clinical laboratory and imaging services, durable medical equipment (DME) and home health services for people with Medicare.

What this does not show: Can order Medicare-covered services

It does not mean the clinician offers these services directly.

Source: CMS Medicare Fee-For-Service Public Provider Enrollment (PECOS); CMS Order and Referring file.

Guide: What ordering and referring status means

Compared with the same specialty in Tulsa and Oklahoma

Billing and prescribing volume is not a quality rating.

Medicare Part B services

More Medicare Part B services than 90% of clinicians listed under Internal Medicine in Tulsa, OK (2024, 196 clinicians with data). Median for this group: 690. Middle half: 397 to 1,313.

More Medicare Part B services than 80% of clinicians listed under Internal Medicine in Oklahoma (2024, 608 clinicians with data). Median for this group: 786. Middle half: 370 to 1,552.

Medicare-allowed amount

A higher Medicare-allowed amount than 80% of clinicians listed under Internal Medicine in Tulsa, OK (2024, 196 clinicians with data). Median for this group: $67,394. Middle half: $41,187 to $101,502.

A higher Medicare-allowed amount than 75% of clinicians listed under Internal Medicine in Oklahoma (2024, 608 clinicians with data). Median for this group: $72,879. Middle half: $34,595 to $122,743.

Paid by Medicare

A higher Medicare payment amount than 80% of clinicians listed under Internal Medicine in Tulsa, OK (2024, 196 clinicians with data). Median for this group: $50,257. Middle half: $28,716 to $78,800.

A higher Medicare payment amount than 70% of clinicians listed under Internal Medicine in Oklahoma (2024, 608 clinicians with data). Median for this group: $54,503. Middle half: $25,299 to $94,383.

Medicare Part D prescriptions

More Part D prescriptions than 85% of clinicians listed under Internal Medicine in Tulsa, OK (2024, 196 clinicians with data). Median for this group: 739. Middle half: 98 to 5,882.

More Part D prescriptions than 85% of clinicians listed under Internal Medicine in Oklahoma (2024, 661 clinicians with data). Median for this group: 626. Middle half: 89 to 5,646.

Part D drug cost

A higher Part D drug cost than 85% of clinicians listed under Internal Medicine in Tulsa, OK (2024, 196 clinicians with data). Median for this group: $94,990. Middle half: $3,786 to $659,546.

A higher Part D drug cost than 85% of clinicians listed under Internal Medicine in Oklahoma (2024, 661 clinicians with data). Median for this group: $76,711. Middle half: $1,967 to $572,569.

308 active clinicians are listed under Internal Medicine with a practice address in Tulsa, OK (1,116 in Oklahoma).

Addresses are self-reported to NPPES and may be out of date.

Telehealth indicator in Tulsa

20.8% of these 308 clinicians have the CMS telehealth indicator.

67.2% of these 308 clinicians are listed by CMS as accepting Medicare assignment.

Sources: CMS Medicare Physician & Other Practitioners (2024), CMS Medicare Part D Prescribers (2024), CMS Open Payments (2025), CMS Doctors and Clinicians, CMS NPPES NPI Registry. Specialty names follow the NUCC Health Care Provider Taxonomy.

Text: T-MedInfo ยท Report an error.

Pharma & Medical Device Financial Disclosures

Payments and other transfers of value that drug and medical device companies reported to CMS Open Payments

Open Payments ยท Program Year 2025
Disclosure Year:

Program year 2025 (payments made January 1 โ€“ December 31, 2025): 62 records totaling $1,152.04.

Manufacturer Payment Nature Product Type Amount ($)
AstraZeneca Pharmaceuticals LP
Food and Beverage
In-kind items and services
FARXIGA General $33.62
AstraZeneca Pharmaceuticals LP
Food and Beverage
In-kind items and services
FARXIGA General $31.43
Daiichi Sankyo Inc.
Food and Beverage
In-kind items and services
INJECTAFER General $28.47
Phathom Pharmaceuticals, Inc.
Food and Beverage
Cash or cash equivalent
VOQUEZNA General $25.96
Inspire Medical Systems, Inc.
Food and Beverage
In-kind items and services
INSPIRE General $25.86
Boehringer Ingelheim Pharmaceuticals, Inc.
Food and Beverage
In-kind items and services
JARDIANCE General $24.99
Astellas Pharma US Inc
Food and Beverage
In-kind items and services
Veozah General $24.84
Eisai Inc.
Food and Beverage
In-kind items and services
Leqembi General $23.63
Pfizer Inc.
Food and Beverage
In-kind items and services
NURTEC ODT General $23.09
Dexcom, Inc.
Food and Beverage
In-kind items and services
Dexcom G6 Transmitter General $22.98
Eli Lilly and Company
Food and Beverage
In-kind items and services
KISUNLA General $22.89
Otsuka America Pharmaceutical, Inc.
Food and Beverage
In-kind items and services
REXULTI General $22.83
Novo Nordisk Inc
Food and Beverage
In-kind items and services
Wegovy General $22.18
AstraZeneca Pharmaceuticals LP
Food and Beverage
In-kind items and services
FARXIGA General $21.07
Pfizer Inc.
Food and Beverage
In-kind items and services
PREVNAR 20 General $21.00
Pfizer Inc.
Food and Beverage
In-kind items and services
PREVNAR 20 General $20.96
Astellas Pharma US Inc
Food and Beverage
In-kind items and services
Veozah General $20.95
Pfizer Inc.
Food and Beverage
In-kind items and services
NURTEC ODT General $20.34
Boehringer Ingelheim Pharmaceuticals, Inc.
Food and Beverage
In-kind items and services
JARDIANCE General $19.30
Azurity Pharmaceuticals, Inc.
Food and Beverage
In-kind items and services
ALVESCO General $19.28
Pfizer Inc.
Food and Beverage
In-kind items and services
PREVNAR 20 General $19.22
AstraZeneca Pharmaceuticals LP
Food and Beverage
In-kind items and services
FARXIGA General $19.02
Pfizer Inc.
Food and Beverage
In-kind items and services
NURTEC ODT General $18.88
Pfizer Inc.
Food and Beverage
In-kind items and services
PREVNAR 20 General $18.79
Gilead Sciences, Inc.
Food and Beverage
In-kind items and services
โ€” General $18.77

(top 25 shown)

Source: CMS Open Payments, program year 2025, released June 30, 2026.

Performed Procedures & Service Volume

Services billed to Original Medicare Part B in 2024.

CMS Part B ยท Data Year 2024
Reporting Year:

CPTยฎ is a registered trademark of the American Medical Association. CPT codes, descriptions and other data only are copyright 2022โ€“2023 American Medical Association. All rights reserved. Applicable FARS/HHSARS apply. Descriptions of CPT codes are the AMA's CPT Consumer Friendly Descriptors as published by CMS in the Medicare Physician & Other Practitioners โ€“ by Provider and Service data, 2023โ€“2024; they are plain-language summaries, not for clinical coding or documentation. HCPCS Level II codes and descriptions are from CMS. Fee schedules, relative value units, conversion factors and/or related components are not assigned by the AMA, are not part of CPT, and the AMA is not recommending their use. The AMA does not directly or indirectly practice medicine or dispense medical services. The AMA assumes no liability for data contained or not contained herein.

HCPCS Code Services Patients Submitted Charge Medicare Allowed
G2211 Visit complexity inherent to evaluation and management associated with medical care services that serve as the continuing focal point for all needed health care services and/or with medical care services that are part of ongoing care related to a patient's
755 414 $35.00 $15.30
99214 Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more
735 374 $213.80 $83.95
G0439 Annual wellness visit, includes a personalized prevention plan of service (pps), subsequent visit
238 238 $225.00 $54.46
99204 New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more
102 102 $317.00 $154.23
99213 Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more
85 80 $151.76 $68.32
93793 Anticoagulant management of patient taking warfarin
55 12 $26.00 $10.54
99495 Transitional care management services for problem of at least moderate complexity
49 46 $418.47 $118.47
G0008 Administration of influenza virus vaccine
38 38 $41.00 $30.07
90653 Influenza vaccine, inactivated
34 34 $90.00 $81.82
90677 Pneumococcal conjugate vaccine, 20 valent (pcv20), for intramuscular use
16 16 $529.00 $289.78
G0009 Administration of pneumococcal vaccine
16 16 $41.00 $30.07
71046 X-ray of chest, 2 views
13 12 $50.08 $20.41
99215 Established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more
12 11 $302.00 $127.66
93000 Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report
11 11 $52.00 $13.13
G0180 Physician or allowed practitioner certification for medicare-covered home health services under a home health plan of care (patient not present), including contacts with home health agency and review of reports of patient status required by physicians and
11 11 $117.00 $49.25

Source: CMS Part B by Provider and Service, 2024; services under 11 beneficiaries omitted by CMS. Privacy limits

Submitted charges are billed amounts, not a price quote for your visit.

Medicare Part D Prescribing Profile & Medications

Medicare Part D prescriptions filled, including refills, in 2024.

CMS Part D ยท Data Year 2024
Prescription Year:
Brand Name Generic Name Prescriptions Day Supply Total Cost Patients
Atorvastatin Calcium Atorvastatin Calcium 429 38,235 $11,850.40 192
Amlodipine Besylate Amlodipine Besylate 386 29,283 $3,901.05 149
Levothyroxine Sodium Levothyroxine Sodium 350 27,216 $3,395.64 135
Gabapentin Gabapentin 298 14,210 $5,193.35 87
Telmisartan Telmisartan 284 21,662 $13,694.34 109
Losartan Potassium Losartan Potassium 283 23,561 $4,564.83 109
Rosuvastatin Calcium Rosuvastatin Calcium 260 21,892 $7,068.91 123
Lisinopril Lisinopril 220 18,366 $2,082.48 96
Pantoprazole Sodium Pantoprazole Sodium 217 14,719 $4,118.02 85
Furosemide Furosemide 189 12,674 $950.49 86
Omeprazole Omeprazole 188 14,770 $3,892.76 78
Hydrochlorothiazide Hydrochlorothiazide 179 13,854 $794.91 72
Duloxetine Hcl Duloxetine Hcl 168 10,718 $4,626.79 64
Metoprolol Succinate Metoprolol Succinate 166 12,325 $2,672.41 71
Eliquis Apixaban 166 7,530 $140,906.80 49
Tamsulosin Hcl Tamsulosin Hcl 164 12,163 $2,185.98 66
Meloxicam Meloxicam 162 8,800 $1,927.34 63
Potassium Chloride Potassium Chloride 153 10,369 $2,942.28 61
Trazodone Hcl Trazodone Hcl 144 9,812 $1,422.25 57
Celecoxib Celecoxib 139 6,043 $4,379.89 56
Alendronate Sodium Alendronate Sodium 138 8,130 $1,496.87 46
Metoprolol Tartrate Metoprolol Tartrate 131 9,681 $1,277.15 57
Trelegy Ellipta Fluticasone/Umeclidin/Vilanter 128 4,200 $87,805.98 32
Ozempic Semaglutide 121 4,108 $120,513.33 28
Carvedilol Carvedilol 118 7,070 $1,198.34 43

(top 25 shown)

Source: CMS Part D by Provider and Drug, 2024; rows below 11 claims omitted by CMS; volume isn’t quality. Privacy limits

Specialties & License Numbers Reported to NPPES

Self-certified to NPPES: 2023-08-16
Internal Medicine Primary Specialty

NUCC Taxonomy Code: 207R00000X

License # reported to NPPES OK 7948

A physician who provides long-term, comprehensive care in the office and the hospital, managing both common and complex illness of adolescents, adults and the elderly. Internists are trained in the diagnosis and treatment of cancer, infections and diseases affecting the heart, blood, kidneys, joints and digestive, respiratory and vascular systems. They are also trained in the essentials of primary care internal medicine, which incorporates an understanding of disease prevention, wellness, substance abuse, mental health and effective treatment of common problems of the eyes, ears, skin, nervous system and reproductive organs.

Internal Medicine

NUCC Taxonomy Code: 207R00000X

License # reported to NPPES TX BP10071313

A physician who provides long-term, comprehensive care in the office and the hospital, managing both common and complex illness of adolescents, adults and the elderly. Internists are trained in the diagnosis and treatment of cancer, infections and diseases affecting the heart, blood, kidneys, joints and digestive, respiratory and vascular systems. They are also trained in the essentials of primary care internal medicine, which incorporates an understanding of disease prevention, wellness, substance abuse, mental health and effective treatment of common problems of the eyes, ears, skin, nervous system and reproductive organs.

Check License Status with the State Board License numbers are self-reported to NPPES; T-MedInfo does not confirm them against state records. Current status: Oklahoma State Board of Medical Licensure.
Look Up on State Board Site

Medicare (PECOS) Enrollment & Ordering Eligibility

Source: CMS PECOS
Medicare FFS Enrollment Status Medicare Enrollment on File
CMS Provider Specialty

PRACTITIONER - HOSPITALIST

Medicare Enrollment ID

I20240212000046

Enrollment State Jurisdiction

TX

PECOS Control ID

0446671796

Medicare Order & Referring Eligibility
Clinical Lab & Imaging (Part B) Eligible
Durable Medical Equipment (DME) Eligible
Home Health Agency (HHA) Eligible
Power Mobility Devices (PMD) Eligible

Sources: CMS Provider Enrollment and Order and Referring. Medicare enrollment is a billing status, not an accreditation or quality rating.

Medicare Group Practice Enrollments

Source: CMS Doctors and Clinicians National Downloadable File

Warren Clinic Inc

6161 S Yale Ave, Tulsa, OK 741361902

Phone: 9185024720

Warren Clinic Inc

6600 S Yale Ave, Tulsa, OK 741363331

Phone: 9184886000

Clinicians Sharing This Practice Address or Phone

Clinicians sharing this NPPES address, phone or fax; a shared contact does not mean they work together.

5 listed
Dr. Scott Asakevich , MD

Internal Medicine

NPI 1356309769

Doctor of Medicine (M.D.)

Dr. Brent Dennis , MD

Internal Medicine

NPI 1932185709

Doctor of Medicine (M.D.)

NPI 1508447533

Doctor of Osteopathic Medicine (D.O.), Master of Public Health, AAHIVS

Dr. Steve Sanders , DO

Internal Medicine

NPI 1518969252

Doctor of Osteopathic Medicine (D.O.)

Cristina Sarrosa , APRN-CNP

Nurse Practitioner - Primary Care

NPI 1376097261

Advanced Practice Registered Nurse - Certified Nurse Practitioner

Career & Practice History Timeline

Changes recorded in monthly NPPES data files: addresses, names, credentials, specialties and NPI status

9 Historical Events
๐Ÿ“
Updated Business Mailing Address August 16, 2023

Registered at 6600 S YALE AVE STE 600, TULSA, OK 741363363

๐Ÿ“
Updated Practice Location July 17, 2023

Registered at 6600 S YALE AVE STE 600, TULSA, OK 741363363 (Tel: 9184915990)

๐Ÿ“
Updated Business Mailing Address July 17, 2023

Registered at 6600 S YALE AVE STE 1400, TULSA, OK 741363331

โœ…
NPI Profile Active May 08, 2020

NPI status registered as active in NPPES database

๐Ÿ“
Practice Location (Initial Record) May 08, 2020

Registered at 301 UNIVERSITY BLVD, GALVESTON, TX 775555303 (Tel: 4097722650)

๐Ÿ“
Business Mailing Address (Initial Record) May 08, 2020

Registered at 301 UNIVERSITY BLVD, GALVESTON, TX 775555303 (Tel: 4097722650)

๐Ÿ‘ค
Provider Name / Credentials (Initial Record) May 08, 2020

Recorded as BENJAMIN GREINER, DO, MPH

๐ŸŽ“
Medical Taxonomy / Specialty Registered (Primary Specialty) May 08, 2020

Internal Medicine (license number reported to NPPES: TX BP10071313)

๐ŸŸข
Initial NPI Registration & Enumeration May 08, 2020

First registered as active Individual Practitioner in NPPES Database.

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NPI Administrative Meta

NPI Number: 1902428212
Entity Type:
Individual Provider Physician, Nurse Practitioner, or Solo Healthcare Professional (Type 1 NPI)
Enumeration Date: May 08, 2020
Last Update: August 16, 2023
Sole Proprietor: No

Other Internal Medicine Providers in Tulsa

All Internal Medicine Providers in Tulsa

Mailing Address

6600 S Yale Ave Ste 600

Tulsa, OK 741363363

About This Data NPPES fields (address, phone, specialty, license) are self-reported and may be outdated; Medicare fields follow the CMS dataset named in each section. Correct directly at NPPES.