Medicare Enrolled
Dr. Marc Antonchak, M.D.
Rheumatology · Columbus, OH
Practice pattern: Mixed Practice
— Diverse clinical practice across multiple procedure types
Low-engagement
Very High
DATA COVERAGE
Data in 4 of 4 federal sources
Measures public federal data availability — not provider quality
Informational, not a quality rating.
This page presents federal public records about Dr. Antonchak from CMS (NPPES, Open Payments, Medicare Provider Utilization, PECOS). It is not medical advice, an endorsement, or a judgment of clinical quality. Always consult the provider directly and a licensed clinician for medical decisions. Read methodology →
Are you Dr. Antonchak?
Request a correction or review of any data shown here. Provider portal →
What this data tells you about Dr. Antonchak
Dr. Marc Antonchak is a rheumatology specialist in Columbus, OH, with 18 years of NPI registration. Based on federal Medicare data, Dr. Antonchak performed 75,315 Medicare services across 3,291 unique beneficiaries.
Between the years covered by Open Payments, Dr. Antonchak received a total of $8,292 from 29 pharmaceutical and/or device companies across 596 individual payments. These payments are legal, publicly disclosed under the federal Sunshine Act, and common in rheumatology. Most payments are for meals and travel — low-value interactions common across virtually all practicing physicians. Patients may wish to discuss these relationships with their provider.
The Data Coverage level for Dr. Antonchak is Very High — reflecting how much public federal data is available about this provider. Patients are encouraged to use this data as one of several factors when choosing a healthcare provider.
✓ 18 years in practice
▲ Top 6% volume in OH
$8,292 industry payments
Medicare Practice Summary
Medicare Utilization ↗75,315
Medicare services
Top 6% in OH for rheumatology
3,291
Unique beneficiaries
$16
Avg. Medicare payment
Medicare patients only (65+ / disabled) · How to read this →
~4,184 Medicare services per year of practice
Top procedures by volume
Ranked by number of services performed for Medicare patients. Avg. submitted charge is what the provider billed; avg. Medicare payment is what CMS paid.
| Procedure | Volume | Avg. paid | Avg. submitted |
|---|---|---|---|
| Tocilizumab injection (Actemra) | 30,160 | $5 | $7 |
| Golimumab infusion (Simponi Aria) Administration of golimumab medication directly into a vein. This code specifies the dosage amount of 1 milligram for intravenous delivery. |
17,531 | $10 | $38 |
| Abatacept infusion (Orencia) An injection of abatacept administered under the direct supervision of a physician. This code is used for Medicare when the drug is not self-administered. |
12,425 | $34 | $61 |
| Infliximab infusion (Remicade) An injection of infliximab, excluding biosimilar versions, administered in a 10 mg dose. |
4,020 | $26 | $172 |
| Denosumab injection (Prolia/Xgeva) | 3,000 | $18 | $36 |
| Rituximab injection, 10 mg Administration of a 10 mg dose of rituximab medication via injection. |
2,950 | $63 | $172 |
| Steroid injection (triamcinolone) A 10 mg injection of triamcinolone acetonide, a corticosteroid medication. This code specifies the drug and dosage administered. |
462 | $1 | $3 |
| Intravenous chemotherapy infusion, 1 hour or less Administration of chemotherapy medication directly into a vein. The procedure takes one hour or less to complete. |
402 | $97 | $500 |
| Complete blood count (CBC) with differential An automated laboratory test that measures the levels of red blood cells, white blood cells, and platelets in the blood, including a breakdown of the different types of white blood cells. |
401 | $8 | $31 |
| Office visit, established patient (30-39 min) A follow-up office visit for an existing patient lasting between 30 and 39 minutes. The visit involves medical evaluation and management of the patient's condition. |
380 | $80 | $165 |
| Blood draw (venipuncture) Insertion of a needle into a vein to collect a blood sample. |
339 | $8 | $10 |
| Sed rate test (inflammation marker) This automated test measures how quickly red blood cells settle in a tube to detect inflammation in the body. |
277 | $3 | $21 |
| Office visit, established patient (20-29 min) An office visit for an existing patient lasting between 20 and 29 minutes. The visit involves medical evaluation and management of the patient's condition. |
272 | $58 | $120 |
| C-reactive protein test (inflammation marker) A blood test that measures the level of C-reactive protein to detect the presence of infection or inflammation in the body. |
244 | $5 | $33 |
| Autoimmune disorder antibody test A laboratory test that measures antibodies in the blood to help assess for autoimmune disorders. |
241 | $17 | $46 |
| Blood creatinine level test A blood test that measures the amount of creatinine, a waste product from muscle wear and tear, to help assess kidney function. |
215 | $5 | $14 |
| Liver enzyme (SGPT) level test A blood test that measures the level of the liver enzyme SGPT to assess liver function. |
202 | $5 | $22 |
| Comprehensive metabolic blood panel A blood test that measures a group of chemicals, including glucose, electrolytes, and kidney and liver function markers. |
199 | $10 | $29 |
| Liver enzyme (SGOT) level test A blood test that measures the level of the liver enzyme SGOT to help assess liver health. |
188 | $5 | $21 |
| Dexamethasone injection (steroid) An injection of dexamethasone sodium phosphate, a corticosteroid medication, administered in a dose of 1 milligram. |
130 | $0 | $6 |
| Intravenous injection of additional new drug or substance Administration of an additional new medication or substance directly into a vein. |
129 | $12 | $77 |
| Additional hour of intravenous chemotherapy This code represents the administration of chemotherapy medication into a vein for each additional hour beyond the initial period. |
89 | $21 | $120 |
| Non-hormonal chemotherapy injection This procedure involves administering non-hormonal anti-neoplastic chemotherapy medication via injection into the skin or muscle tissue. |
86 | $52 | $172 |
| Zoledronic acid injection, 1 mg An injection of zoledronic acid administered at a dose of 1 mg. |
75 | $5 | $88 |
| Complement and antigen measurement A laboratory test to measure levels of complement proteins and antigens in the blood. |
68 | $12 | $64 |
| Tuberculosis blood test (gamma interferon) A blood test that measures the immune system's response to tuberculosis bacteria using gamma interferon levels. |
61 | $60 | $154 |
| Total calcium level test A blood test that measures the total amount of calcium in your body. |
51 | $5 | $16 |
| Diphenhydramine injection, up to 50 mg An injection of diphenhydramine hydrochloride, an antihistamine medication, administered in a dose of up to 50 milligrams. |
51 | $1 | $4 |
| Joint injection, major joint Removal of fluid from a large joint and/or injection of medication into the joint space. |
49 | $49 | $162 |
| Intravenous infusion, 1 hour or less Administration of medication or fluid directly into a vein for therapeutic, preventive, or diagnostic purposes. The procedure lasts one hour or less. |
47 | $45 | $280 |
| X-ray of hand, 2 views An X-ray imaging test of the hand using two different angles to visualize the bones and joints. |
46 | $22 | $49 |
| Vitamin D level test A blood test to measure the amount of Vitamin D-3 in your body. |
44 | $28 | $123 |
| Methylprednisolone injection, up to 40 mg An injection of methylprednisolone sodium succinate, a corticosteroid medication, administered in a dose of up to 40 mg. |
42 | $3 | $10 |
| Albumin level test A blood test that measures the amount of albumin, a protein made by the liver, in your body. |
41 | $5 | $14 |
| New patient office visit (30-44 min) An initial office visit for a new patient lasting between 30 and 44 minutes. This code is used when the total time spent on the date of the encounter falls within this range. |
39 | $75 | $170 |
| Methylprednisolone injection, up to 125 mg An injection of methylprednisolone sodium succinate, a corticosteroid medication, with a dosage of up to 125 mg. |
36 | $4 | $10 |
| Joint fluid aspiration or injection, small joint Removal of fluid from a small joint or injection of medication into a small joint. |
30 | $33 | $99 |
| Shoulder X-ray, 2+ views An X-ray imaging test of the shoulder joint using at least two different angles to visualize the bones and surrounding structures. |
29 | $23 | $57 |
| Bone density scan (DEXA) A test that uses low-dose X-rays to measure bone mineral density in the hip, pelvis, and spine. It helps assess bone strength and risk of fractures. |
29 | $36 | $189 |
| New patient office visit (45-59 min) An initial office visit for a new patient lasting between 45 and 59 minutes. This code covers the total time spent by the physician or qualified healthcare professional on the date of the encounter. |
28 | $104 | $255 |
| Uric acid level test A blood test that measures the level of uric acid in your body. Uric acid is a waste product formed when the body breaks down purines. |
26 | $4 | $30 |
| Knee X-ray, 1-2 views An X-ray imaging test of the knee joint using one to two different angles to visualize the bones and surrounding structures. |
25 | $24 | $57 |
| Urinalysis with microscopic exam A urine test performed manually that includes examining the sample under a microscope to check for abnormalities. |
24 | $3 | $20 |
| X-ray of lower and sacral spine, 2-3 views An X-ray imaging test that captures 2 to 3 views of the lower back and sacral spine to visualize the bones and joints in this area. |
21 | $28 | $74 |
| Flu vaccine administration This procedure involves the administration of the influenza virus vaccine. It covers the process of delivering the vaccine to the patient. |
21 | $29 | $36 |
| Cardiac enzyme level (CK-MB) test A blood test that measures the total level of creatine kinase, specifically the cardiac enzyme fraction, to help evaluate heart muscle damage. |
18 | $6 | $34 |
| Flu vaccine, quadrivalent A flu shot containing four strains of the influenza virus to help prevent seasonal influenza infection. |
17 | $75 | $108 |
| Ferritin level test (iron stores) A blood test that measures the level of ferritin, a protein that stores iron in the body. |
16 | $13 | $45 |
| Thyroid stimulating hormone (TSH) test A blood test that measures the level of thyroid stimulating hormone to evaluate thyroid function. |
15 | $16 | $70 |
| X-ray of upper spine, 4-5 views An X-ray imaging test of the upper spine using 4 to 5 different views to visualize the bones and structures in that area. |
12 | $39 | $90 |
| Pelvis X-ray, 1-2 views An X-ray imaging test of the pelvic area using one to two different angles to visualize the bones and joints. |
12 | $21 | $60 |
How to read this data: This reflects Medicare patients only (typically 65+). Payment amounts are what Medicare paid the provider, not your out-of-pocket cost. A higher procedure volume generally indicates more experience with that procedure.
45.7% high complexity
49.5% medium
4.8% routine
Industry Payment Transparency
Open Payments through 2024 ↗$8,292
Total received (2018-2024)
Avg $1,185/year across 7 years
Top 30% in OH for rheumatology
A higher payment rank reflects disclosed industry relationships (consulting, research, speaking) common among subspecialists — not wrongdoing.
29
Companies
596
Individual payments
All payments are legal and publicly reported · Not evidence of wrongdoing · How to interpret →
Payment profile
Industry payments classified by relationship type. Not all payments are equal — research and consulting reflect different relationships than speaking programs or meals.
Meals & Travel
Food, beverages, travel, and lodging — typically low-value
$8,292 (100.0%)
Payment trend by year
Annual totals from pharmaceutical and medical device companies.
2024
$2,532
2023
$2,055
2022
$1,273
2021
$520
2020
$347
2019
$550
2018
$1,014
Payments by company (2024)
Consulting
Speaking
Meals & Travel
Research
ABBVIE INC.
$888
Amgen Inc.
$521
Janssen Biotech, Inc.
$363
Novartis Pharmaceuticals Corporation
$271
PFIZER INC.
$200
GlaxoSmithKline, LLC.
$77
Organon Llc
$68
UCB, Inc.
$68
AstraZeneca Pharmaceuticals LP
$43
Lilly USA, LLC
$19
SOBI, INC
$15
Top 3 companies account for 70.0% of 2024 payments
All-time payments by company (2018-2024) ›
ABBVIE INC.
$1,508
Amgen Inc.
$1,176
AbbVie Inc.
$1,120
Novartis Pharmaceuticals Corporation
$841
Genentech USA, Inc.
$597
PFIZER INC.
$531
Janssen Biotech, Inc.
$495
Horizon Therapeutics plc
$433
GlaxoSmithKline, LLC.
$229
E.R. Squibb & Sons, L.L.C.
$225
Aurinia Pharma U.S., Inc.
$217
UCB, Inc.
$181
Celgene Corporation
$135
Lilly USA, LLC
$108
Organon Llc
$68
AbbVie, Inc.
$64
AstraZeneca Pharmaceuticals LP
$55
Mallinckrodt LLC
$53
Alexion Pharmaceuticals, Inc.
$49
Horizon Pharma plc
$37
Takeda Pharmaceuticals U.S.A., Inc.
$31
GENZYME CORPORATION
$30
Mission Pharmacal Company
$29
Octapharma USA, Inc.
$18
Sandoz Inc.
$16
SOBI, INC
$15
Mallinckrodt Enterprises LLC
$14
NeuroMetrix Inc
$11
FIDIA PHARMA USA INC.
$6
Top 3 companies account for 45.9% of all-time payments
Associated products mentioned in payments ›
ACTHAR · Actemra · Aquoral · BENLYSTA · Bimzelx · COSENTYX · Cimzia · EMBEDA · EVENITY · Enbrel · FORTEO · HUMIRA · HYRIMOZ · Humira · Hymovis · ILARIS · KEVZARA · KINERET · KRYSTEXXA · LUPKYNIS · LYRICA · NUCALA · OCTAGAM IMMUNE GLOBULIN (HUMAN) · ORENCIA · Otezla · Prolia · RENFLEXIS · RINVOQ · Rinvoq · Rituxan · SAPHNELO · SIMPONI ARIA · SKYRIZI · STELARA · Strensiq · TALTZ · TAVNEOS · TREMFYA · Tavneos · Uloric · XELJANZ
Should you be concerned? Payments from pharmaceutical and device companies are legal and common — 57% of U.S. physicians receive at least one. They often reflect legitimate consulting, research, or education. What matters is whether a recommended drug or device appears in your doctor's payment records. If so, consider asking your doctor about it. How to interpret this data →
Most payments (100%) are for meals and travel — low-value interactions that are common across virtually all practicing physicians.
Geographic Context
Rheumatologists within 10 mi
43
Per 100K population
3.3
County median income
$73,795
Nearest hospital
GRANT MEDICAL CENTER
0.0 mi
0.0 mi
Data Sources
| Provider Registry | ✓ NPPES | Weekly updates |
| Medicare Enrollment | ✓ PECOS | Monthly updates |
| Practice Data | ✓ Medicare Util. | Annual (CY lag) |
| Industry Payments | ✓ Open Payments | CY 2024 |
| Disciplinary History | — Not public | N/A |
This provider has data in 4 of 4 available federal datasets, with a Data Coverage level of Very High. This reflects how much public data is available about a provider. How we calculate this →
Summary
Dr. Antonchak is a mixed practice specialist, with above-average Medicare volume (top 6% in OH), with low-engagement industry engagement, with 18 years of NPI registration.
This summary is auto-generated from federal data, describing data availability and patterns. Read our methodology →
Frequently Asked Questions
Is Dr. Antonchak experienced with tocilizumab injection (actemra)?
Based on Medicare claims data, Dr. Antonchak performed 30,160 tocilizumab injection (actemra) services. Research suggests that higher procedure volume is often associated with better outcomes, particularly for complex procedures. Note that Medicare data only captures patients aged 65 and older, so the total practice volume across all patients is likely higher.
Does Dr. Antonchak receive payments from pharmaceutical companies?
Yes. Dr. Antonchak received a total of $8,292 from 29 companies across 596 individual payments. These payments are legal, publicly disclosed under the federal Sunshine Act, and common among physicians — 57% of all U.S. physicians receive at least one industry payment. Patients may wish to ask their doctor about these relationships, especially if a recommended drug or device appears in the payment records.
How do Dr. Antonchak's costs compare to other rheumatologists in Columbus?
Dr. Antonchak's average Medicare payment per service is $16. Note that these figures represent what Medicare pays, not your out-of-pocket cost, which depends on your specific insurance plan and deductible. Procedure-level data above shows both what was submitted and what Medicare paid for each service type.
What does Data Coverage mean?
Data Coverage (currently Very High for Dr. Antonchak) measures how much public federal data is available about a provider. It is not a quality rating. A "Very High" or "High" level means the provider has data across multiple federal sources (NPPES, PECOS, Medicare Utilization, Open Payments), indicating a long track record of practice, Medicare participation, and industry disclosure. A "Low" or "Moderate" level may simply mean the provider is newer, does not see Medicare patients, or has not received any industry payments — none of which are inherently negative. Read our full methodology →
Is this data up to date?
Each data source has its own update cycle. Provider registry data (NPPES) is updated weekly. Medicare enrollment (PECOS) is updated monthly. Medicare practice data has a ~2 year lag — the most recent available is typically 2 years prior. Industry payment data (Open Payments) is published annually, usually in June, covering the prior calendar year. We display the data date prominently on each section so you always know how current it is. See our data freshness policy →
Explore related providers
Same specialty & city
Rheumatologists in Columbus
Browse rheumatologists in Columbus ranked by procedure volume and transparency data.
Highest volume
Top Rheumatologists in OH
Rheumatologists ranked by total Medicare services performed statewide.
Industry payments
Pharma Payments to Rheumatologists in OH
Which OH rheumatologists receive the most from drug and device companies.
By company
ABBVIE INC. Payments to Doctors
See all physicians who received payments from ABBVIE INC.
By company
Amgen Inc. Payments to Doctors
See all physicians who received payments from Amgen Inc.
By company
AbbVie Inc. Payments to Doctors
See all physicians who received payments from AbbVie Inc.
About this page
All data on this page is sourced verbatim from public federal records published by the U.S. Centers for Medicare & Medicaid Services (CMS): NPPES ↗, Open Payments ↗, Medicare Provider Utilization ↗, and PECOS. Publication is mandated by the Physician Payments Sunshine Act (§6002 ACA, 42 U.S.C. §1320a-7h) and the Freedom of Information Act.
This page is not medical advice, an endorsement, a recommendation, or a quality rating. Data Coverage reflects data completeness — how much federal information exists for this provider — not clinical performance, patient outcomes, or quality of care. Always verify information directly with the provider and consult a licensed clinician before making medical decisions.
Provider corrections: Provider portal · Privacy questions: Privacy Policy · Terms: Terms of Use · Methodology: Methodology