Erin Marie Williamson , RN, MSN, APRN
Nurse Practitioner • Tulsa, OK
1145 S. Utica Ave., Suite 701
Tulsa, OK 74104
This profile restates public CMS/NPPES data; T-MedInfo gives no medical advice — consult a licensed professional, and call 911 for emergencies.
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Erin Williamson is listed in NPPES under Nurse Practitioner.
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NPI assigned on July 17, 2009; this date does not establish years in practice.
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Published CMS data list 359 Original Medicare Part B services in 2024.
Source: CMS, Medicare Physician & Other Practitioners – by Provider and Service, 2024. Published rows only; this is not a quality measure.
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Published Part B service records, 2024:
- 99214 — Established patient outpatient office visit: 102 service units.
- 99213 — Established patient outpatient office visit: 100 service units.
- 99204 — New patient outpatient office visit: 52 service units.
Source: CMS, Medicare Physician & Other Practitioners – by Provider and Service, 2024. Units differ by code; these are not visits or a measure of quality.
CPT® only copyright 2023 American Medical Association. All rights reserved. Service names are shortened from CPT Consumer Friendly Descriptors (CMS data, 2024). CPT notice
See all 7 records in the table · Guide: How to read Medicare Part B data
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Published CMS data list 938 Medicare Part D prescriptions, including refills, in 2024.
Source: CMS, Medicare Part D Prescribers – by Provider and Drug, 2024. Published rows only; this is not a quality measure.
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Published Part D records, 2024:
- Pantoprazole Sodium — 188 prescription fills, including refills.
- Omeprazole — 96 prescription fills, including refills.
- Linzess (Linaclotide) — 78 prescription fills, including refills.
Source: CMS, Medicare Part D Prescribers – by Provider and Drug, 2024. Drug names come from pharmacy claims. Listing a drug here is not an endorsement or a recommendation.
See all 27 records in the table · Guide: How to read Medicare Part D prescriber data
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Close to the middle for Medicare Part B services among clinicians listed under Nurse Practitioner in Tulsa, OK (2024, 74 clinicians with data). Median for this group: 403. Middle half: 110 to 711.
Close to the middle for Medicare Part B services among clinicians listed under Nurse Practitioner in Oklahoma (2024, 328 clinicians with data). Median for this group: 342. Middle half: 127 to 785.
Source: CMS, Medicare Physician & Other Practitioners – by Provider and Service, 2024. Billing and prescribing volume is not a quality rating.
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Medicare Part B services went from 516 in 2020 to 359 in 2024.
Source: CMS, Medicare Physician & Other Practitioners – by Provider and Service, 2020–2024.
Practice Location & Contact Primary Location
1145 S. Utica Ave.
Suite 701
Tulsa, OK 74104
Matched by practice address or phone in NPPES. A shared address or phone does not confirm that this clinician works there.
CMS Doctors and Clinicians lists 1 group name: Ahs Oklahoma Physician Group Llc. 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
2008
What Public CMS Data Show
Nurse Practitioner: NPPES taxonomy is a reported classification, not proof of board certification.
Medicare patients
268 people with Original Medicare in 2024
It gives a sense of how many people with Medicare this clinician treated that year.
Source: CMS, Medicare Physician & Other Practitioners – by Provider, 2024.
Medicare-allowed amount
About $33,165 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.
It shows the total cost of this clinician's Original Medicare services under Medicare's fee rules.
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 – by Provider and Service, 2024.
Paid by Medicare
About $24,445 in 2024
The part of the Medicare-allowed amount that Medicare itself paid in 2024, after patients' deductibles and coinsurance.
The gap between the allowed amount and this number is roughly what patients and their other insurance paid.
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 – by Provider and Service, 2024.
30-day fills
1,661 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
$738,684 in 2024
The total cost of these prescriptions in 2024, paid by Medicare drug plans, patients and other payers together.
It shows the total spending on drugs this clinician prescribed, not what any one patient paid.
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 – by Provider and Drug, 2024.
Open Payments general payments, program year 2025
All general payments: $3,141.03 across 92 records.
By nature of payment
- Food and Beverage: $2,238.49 across 89 records.
- Travel and Lodging: $902.54 across 3 records.
Reporting-company totals (3 largest of 17)
- Enterra Medical, Inc.: $1,179.48 across 4 records.
- ABBVIE INC.: $765.42 across 35 records.
- Sanofi and Genzyme US Companies: $168.58 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.
Source: Calculated by T-MedInfo from CMS Open Payments general-payment records for program year 2025 (published June 30, 2026).
Years since graduation
18 years (graduated 2008)
CMS Doctors and Clinicians data list 2008 as the year this clinician finished professional school.
It tells you roughly how long ago the clinician finished 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
2009
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.
With Original Medicare, you usually pay only your deductible and coinsurance, and the office sends the claim to Medicare for you.
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, “Does your provider accept Medicare as full payment?”
Telehealth (some services)
Recent Medicare claims show this clinician provided some services by telehealth, such as a video or phone visit.
You may be able to have some visits without going to the office. Ask which visits can be done by telehealth.
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.
Enrolled in Medicare (PECOS)
Erin Williamson 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.
Can order Medicare-covered services
CMS lists Erin Williamson 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.
Medicare pays for these items and services only when they are ordered by an eligible clinician.
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.
Compared with the same specialty in Tulsa and Oklahoma
Billing and prescribing volume is not a quality rating.
Medicare Part B services
Close to the middle for clinicians listed under Nurse Practitioner in Tulsa, OK (2024, 74 clinicians with data). Median for this group: 403. Middle half: 110 to 711.
Close to the middle for clinicians listed under Nurse Practitioner in Oklahoma (2024, 328 clinicians with data). Median for this group: 342. Middle half: 127 to 785.
Medicare-allowed amount
Close to the middle for clinicians listed under Nurse Practitioner in Tulsa, OK (2024, 74 clinicians with data). Median for this group: $31,065. Middle half: $10,392 to $59,214.
A higher Medicare-allowed amount than 60% of clinicians listed under Nurse Practitioner in Oklahoma (2024, 328 clinicians with data). Median for this group: $24,574. Middle half: $8,536 to $46,557.
Paid by Medicare
Close to the middle for clinicians listed under Nurse Practitioner in Tulsa, OK (2024, 74 clinicians with data). Median for this group: $21,808. Middle half: $6,871 to $44,067.
A higher Medicare payment amount than 60% of clinicians listed under Nurse Practitioner in Oklahoma (2024, 328 clinicians with data). Median for this group: $17,797. Middle half: $6,066 to $34,363.
Medicare Part D prescriptions
More Part D prescriptions than 70% of clinicians listed under Nurse Practitioner in Tulsa, OK (2024, 70 clinicians with data). Median for this group: 461. Middle half: 118 to 1,048.
More Part D prescriptions than 65% of clinicians listed under Nurse Practitioner in Oklahoma (2024, 354 clinicians with data). Median for this group: 393. Middle half: 106 to 1,348.
Part D drug cost
A higher Part D drug cost than 95% of clinicians listed under Nurse Practitioner in Tulsa, OK (2024, 70 clinicians with data). Median for this group: $21,482. Middle half: $2,099 to $147,816.
A higher Part D drug cost than 90% of clinicians listed under Nurse Practitioner in Oklahoma (2024, 354 clinicians with data). Median for this group: $22,589. Middle half: $1,965 to $148,638.
159 active clinicians are listed under Nurse Practitioner with a practice address in Tulsa, OK (703 in Oklahoma).
Addresses are self-reported to NPPES and may be out of date.
Telehealth indicator in Tulsa
15.1% of these 159 clinicians have the CMS telehealth indicator.
58.5% of these 159 clinicians are listed by CMS as accepting Medicare assignment.
CMS data by year
Changes may reflect reporting, coverage or privacy limits, not changes in care quality.
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Medicare Part B services
Medicare Part B services decreased 30% from 516 in 2020 to 359 in 2024.
- 2020: 516
- 2021: 515
- 2022: 309
- 2023: 361
- 2024: 359
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Medicare-allowed amount
Medicare-allowed amount decreased 24% from $43,530 in 2020 to $33,165 in 2024.
- 2020: $43,530
- 2021: $53,844
- 2022: $27,159
- 2023: $38,270
- 2024: $33,165
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Paid by Medicare
Paid by Medicare decreased 25% from $32,799 in 2020 to $24,445 in 2024.
- 2020: $32,799
- 2021: $38,612
- 2022: $18,831
- 2023: $29,138
- 2024: $24,445
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Medicare Part D prescriptions
Medicare Part D prescriptions increased 28% from 732 in 2020 to 938 in 2024.
- 2020: 732
- 2021: 721
- 2022: 753
- 2023: 849
- 2024: 938
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30-day fills
30-day fills increased 32% from 1,256 in 2020 to 1,661 in 2024.
- 2020: 1,256
- 2021: 1,248
- 2022: 1,321
- 2023: 1,464
- 2024: 1,661
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Part D drug cost
Part D drug cost increased 299% from $185,152 in 2020 to $738,684 in 2024.
- 2020: $185,152
- 2021: $243,188
- 2022: $213,928
- 2023: $361,898
- 2024: $738,684
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Industry payments (Open Payments)
Industry payments (Open Payments) went from $338.44 in 2021 to $3,141.03 in 2025.
- 2021: $338.44
- 2022: $1,417.45
- 2023: $2,059.54
- 2024: $2,176.26
- 2025: $3,141.03
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 · 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
Program year 2025 (payments made January 1 – December 31, 2025): 92 records totaling $3,141.03.
| Manufacturer | Payment Nature | Product | Type | Amount ($) |
|---|---|---|---|---|
| Enterra Medical, Inc. |
Travel and Lodging
In-kind items and services
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— | General | $349.19 |
| Enterra Medical, Inc. |
Travel and Lodging
In-kind items and services
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— | General | $290.16 |
| Enterra Medical, Inc. |
Food and Beverage
In-kind items and services
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— | General | $276.94 |
| Enterra Medical, Inc. |
Travel and Lodging
In-kind items and services
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— | General | $263.19 |
| ABBVIE INC. |
Food and Beverage
In-kind items and services
|
CREON | General | $128.61 |
| ABBVIE INC. |
Food and Beverage
In-kind items and services
|
CREON | General | $124.00 |
| Sanofi and Genzyme US Companies |
Food and Beverage
In-kind items and services
|
DUPIXENT | General | $64.58 |
| Regeneron Pharmaceuticals, Inc. |
Food and Beverage
In-kind items and services
|
DUPIXENT | General | $33.21 |
| Regeneron Pharmaceuticals, Inc. |
Food and Beverage
In-kind items and services
|
DUPIXENT | General | $32.90 |
| Madrigal Pharmaceuticals |
Food and Beverage
In-kind items and services
|
REZDIFFRA | General | $32.43 |
| Eli Lilly and Company |
Food and Beverage
In-kind items and services
|
OMVOH | General | $32.13 |
| Aimmune Therapeutics, Inc. |
Food and Beverage
In-kind items and services
|
ZENPEP | General | $30.93 |
| Aimmune Therapeutics, Inc. |
Food and Beverage
In-kind items and services
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ZENPEP | General | $30.38 |
| Amgen Inc. |
Food and Beverage
In-kind items and services
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REPATHA | General | $29.29 |
| Madrigal Pharmaceuticals |
Food and Beverage
In-kind items and services
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REZDIFFRA | General | $28.06 |
| Sandoz Inc. |
Food and Beverage
In-kind items and services
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HYRIMOZ | General | $28.06 |
| ABBVIE INC. |
Food and Beverage
In-kind items and services
|
LINZESS | General | $27.94 |
| ABBVIE INC. |
Food and Beverage
In-kind items and services
|
LINZESS | General | $26.70 |
| Regeneron Pharmaceuticals, Inc. |
Food and Beverage
In-kind items and services
|
DUPIXENT | General | $26.65 |
| ABBVIE INC. |
Food and Beverage
In-kind items and services
|
LINZESS | General | $26.63 |
| Regeneron Pharmaceuticals, Inc. |
Food and Beverage
In-kind items and services
|
DUPIXENT | General | $25.39 |
| Madrigal Pharmaceuticals |
Food and Beverage
In-kind items and services
|
REZDIFFRA | General | $24.60 |
| Eli Lilly and Company |
Food and Beverage
In-kind items and services
|
OMVOH | General | $24.42 |
| Sanofi and Genzyme US Companies |
Food and Beverage
In-kind items and services
|
DUPIXENT | General | $24.38 |
| ABBVIE INC. |
Food and Beverage
In-kind items and services
|
CREON | General | $24.02 |
(top 25 shown)
Source: CMS Open Payments, program year 2025, released June 30, 2026.
Performed Procedures & Service Volume
CPT® is a registered trademark of the American Medical Association. CPT codes, descriptions and other data only are copyright 2016–2023 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 – by Provider and Service data, 2017–2024; 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 |
|---|---|---|---|---|
|
99214
Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more
|
102 | 97 | $224.07 | $100.03 |
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99213
Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more
|
100 | 92 | $158.00 | $71.00 |
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99204
New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more
|
52 | 52 | $344.00 | $132.08 |
|
91010
Study of esophagus to assess movement
|
45 | 45 | $359.00 | $117.66 |
|
91037
Monitoring and recording of esophageal function through nasal tube with electrode
|
32 | 32 | $340.00 | $79.33 |
|
36415
Insertion of needle into vein for collection of blood sample
|
16 | 14 | $7.00 | $6.86 |
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99203
New patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more
|
12 | 12 | $224.00 | $87.56 |
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.
| Brand Name | Generic Name | Prescriptions | Day Supply | Total Cost | Patients |
|---|---|---|---|---|---|
| Pantoprazole Sodium | Pantoprazole Sodium | 188 | 15,492 | $2,317.30 | 76 |
| Omeprazole | Omeprazole | 96 | 7,931 | $1,504.95 | 37 |
| Linzess | Linaclotide | 78 | 3,420 | $59,320.93 | 18 |
| Creon | Lipase/Protease/Amylase | 60 | 2,024 | $205,884.14 | 12 |
| Ondansetron Odt | Ondansetron | 47 | 1,506 | $2,348.98 | 17 |
| Gavilyte-G | Peg3350/Sod Sulf,bicarb,cl/Kcl | 47 | 47 | $766.67 | 45 |
| Peg-3350 And Electrolytes | Peg3350/Sod Sulf,bicarb,cl/Kcl | 40 | 41 | $574.53 | 40 |
| Dicyclomine Hcl | Dicyclomine Hcl | 36 | 1,548 | $684.32 | 16 |
| Famotidine | Famotidine | 35 | 1,801 | $435.32 | — |
| Promethazine Hcl | Promethazine Hcl | 33 | 990 | $512.93 | — |
| Esomeprazole Magnesium | Esomeprazole Magnesium | 33 | 1,890 | $970.66 | — |
| Xifaxan | Rifaximin | 26 | 700 | $83,138.19 | — |
| Dexlansoprazole Dr | Dexlansoprazole | 24 | 1,260 | $7,251.63 | — |
| Sucralfate | Sucralfate | 22 | 880 | $514.64 | — |
| Zenpep | Lipase/Protease/Amylase | 17 | 663 | $66,382.33 | — |
| Sod Sulf-Potass Sulf-Mag Sulf | Sodium, Potassium,mag Sulfates | 16 | 17 | $899.11 | 16 |
| Ondansetron Hcl | Ondansetron Hcl | 15 | 442 | $176.50 | — |
| Spironolactone | Spironolactone | 14 | 960 | $305.62 | — |
| Balsalazide Disodium | Balsalazide Disodium | 14 | 660 | $2,056.04 | — |
| Humira(Cf) Pen | Adalimumab | 14 | 392 | $122,115.06 | — |
| Furosemide | Furosemide | 13 | 1,170 | $64.87 | — |
| Constulose | Lactulose | 13 | 252 | $298.43 | — |
| Vemlidy | Tenofovir Alafenamide | 12 | 360 | $16,759.38 | — |
| Motegrity | Prucalopride Succinate | 12 | 720 | $13,231.27 | — |
| Colestipol Hcl | Colestipol Hcl | 11 | 570 | $630.40 | — |
(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
NUCC Taxonomy Code: 363L00000X
(1) A registered nurse provider with a graduate degree in nursing prepared for advanced practice involving independent and interdependent decision making and direct accountability for clinical judgment across the health care continuum or in a certified specialty. (2) A registered nurse who has completed additional training beyond basic nursing education and who provides primary health care services in accordance with state nurse practice laws or statutes. Tasks performed by nurse practitioners vary with practice requirements mandated by geographic, political, economic, and social factors. Nurse practitioner specialists include, but are not limited to, family nurse practitioners, gerontological nurse practitioners, pediatric nurse practitioners, obstetric-gynecologic nurse practitioners, and school nurse practitioners.
NUCC Taxonomy Code: 363LA2200X
Additional State Medicaid & Healthcare Payer Identifiers
Medicare (PECOS) Enrollment & Ordering Eligibility
Source: CMS PECOSPRACTITIONER - NURSE PRACTITIONER
I20121108000235
OK
0446396121
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
Ahs Oklahoma Physician Group Llc
1145 S Utica Ave, Tulsa, OK 741044019
Phone: 9185826544
Clinicians Sharing This Practice Address or Phone
Clinicians sharing this NPPES address, phone or fax; a shared contact does not mean they work together.
Surgery - Surgical Oncology
Doctor of Medicine (M.D.)
Internal Medicine - Gastroenterology
Doctor of Osteopathic Medicine (D.O.)
Nurse Practitioner - Acute Care
Certified Nurse Practitioner
Nurse Practitioner - Acute Care
Nurse Practitioner - Acute Care
Advanced Practice Registered Nurse
Physician Assistant
Physician Assistant
Career & Practice History
NPI enumerated July 17, 2009.
No changes to the name, practice address, taxonomy or NPI status in this record have been observed in the monthly NPPES data files from January 2017 to August 2026.
NPI Administrative Meta
Other Nurse Practitioners in Tulsa
- Kathryn Landreneau, APRN, FNP-BC
- Martha Cheatwood, ARNP
- Christopher Webber, CNP
- Susan Snyder, APRN
- Melissa Warren
- Rachel Mathew, APRN-CNP
Mailing Address
1145 S. Utica Ave., Suite 701
Tulsa, OK 74104
Phone: 9185826544