Dr. Mark S Feldman , MD
Specialist • Belleville, IL
311 W Lincoln St, Suite 100
Belleville, IL 622201902
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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NPI assigned on January 20, 2006; this date does not establish years in practice.
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Published CMS data list 260 Original Medicare Part B services in 2020.
Source: CMS, Medicare Physician & Other Practitioners – by Provider and Service, 2020. Published rows only; this is not a quality measure.
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Published Part B service records, 2020:
- 96365 — Infusion into a vein for therapy, prevention, or diagnosis: 92 service units.
- 99214 — Established patient outpatient office visit: 54 service units.
- 99213 — Established patient outpatient office visit: 29 service units.
Source: CMS, Medicare Physician & Other Practitioners – by Provider and Service, 2020. Units differ by code; these are not visits or a measure of quality.
CPT® only copyright 2019 American Medical Association. All rights reserved. Service names are shortened from CPT Consumer Friendly Descriptors (CMS data, 2020). CPT notice
See all 8 records in the table · Guide: How to read Medicare Part B data
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Published CMS data list 376 Medicare Part D prescriptions, including refills, in 2020.
Source: CMS, Medicare Part D Prescribers – by Provider and Drug, 2020. Published rows only; this is not a quality measure.
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Published Part D records, 2020:
- Omeprazole — 93 prescription fills, including refills.
- Pantoprazole Sodium — 42 prescription fills, including refills.
- Linzess (Linaclotide) — 39 prescription fills, including refills.
Source: CMS, Medicare Part D Prescribers – by Provider and Drug, 2020. Drug names come from pharmacy claims. Listing a drug here is not an endorsement or a recommendation.
See all 12 records in the table · Guide: How to read Medicare Part D prescriber data
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Medicare Part B services went from 1,093 in 2017 to 260 in 2020.
Source: CMS, Medicare Physician & Other Practitioners – by Provider and Service, 2017–2020.
Practice Location & Contact Primary Location
311 W Lincoln St
Suite 100
Belleville, IL 622201902
Matched by practice address or phone in NPPES. A shared address or phone does not confirm that this clinician works there.
What Public CMS Data Show
Specialist: NPPES taxonomy is a reported classification, not proof of board certification.
Medicare-allowed amount
About $40,614 in 2020
The total amount Medicare approved for these services in 2020. 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, 2020.
Paid by Medicare
About $29,669 in 2020
The part of the Medicare-allowed amount that Medicare itself paid in 2020, 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, 2020.
30-day fills
557 standardized 30-day fills in 2020
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
$49,793 in 2020
The total cost of these prescriptions in 2020, 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, 2020.
Industry payments (Open Payments)
Fewer than 11 payment records totaling $56.99 in 2022
Drug and medical device companies must report certain payments to doctors and some other clinicians to CMS, such as meals, travel, speaking fees or research funding.
It shows reported financial ties between this clinician and companies. You can ask your clinician about them.
These records are submitted by drug and medical device companies, and a reported payment does not necessarily mean the financial relationship is improper.
General: payments not tied to research, such as meals, travel, consulting or speaking fees.
A reported payment does not necessarily mean the financial relationship is improper. Research payments can go to a hospital or university for a study the clinician leads, not to the clinician personally. Clinicians can dispute records with the company that reported them.
Source: CMS Open Payments, program year 2022.
NPI first issued
2006
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.
Medicare assignment not listed
CMS data do not show whether this clinician accepts Medicare assignment. This does not mean they do not accept Medicare. Ask the office.
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?”
No telehealth indicator
CMS shows this indicator only when recent Medicare claims include telehealth services. The clinician may still offer telehealth; ask the office.
Source: CMS, Telehealth Indicator on Medicare Care Compare (fact sheet, January 2023); CMS Doctors and Clinicians.
Compared with the same specialty in Belleville and Illinois
Billing and prescribing volume is not a quality rating.
Medicare Part B
Comparisons use 2024 data. The latest CMS data for Dr. Feldman are from 2020.
Medicare Part D
Comparisons use 2024 data. The latest CMS data for Dr. Feldman are from 2020.
8 active clinicians are listed under Specialist with a practice address in Belleville, IL (1,157 in Illinois).
Addresses are self-reported to NPPES and may be out of date.
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 76% from 1,093 in 2017 to 260 in 2020.
- 2017: 1,093
- 2018: 920
- 2019: 1,031
- 2020: 260
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Medicare-allowed amount
Medicare-allowed amount decreased 79% from $195,729 in 2017 to $40,614 in 2020.
- 2017: $195,729
- 2018: $160,356
- 2019: $200,417
- 2020: $40,614
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Paid by Medicare
Paid by Medicare decreased 81% from $152,725 in 2017 to $29,669 in 2020.
- 2017: $152,725
- 2018: $127,414
- 2019: $156,219
- 2020: $29,669
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Medicare Part D prescriptions
Medicare Part D prescriptions decreased 68% from 1,172 in 2016 to 376 in 2020.
- 2016: 1,172
- 2017: 975
- 2018: 931
- 2019: 744
- 2020: 376
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30-day fills
30-day fills decreased 64% from 1,536 in 2016 to 557 in 2020.
- 2016: 1,536
- 2017: 1,318
- 2018: 1,257
- 2019: 1,109
- 2020: 557
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Part D drug cost
Part D drug cost decreased 93% from $711,054 in 2016 to $49,793 in 2020.
- 2016: $711,054
- 2017: $218,057
- 2018: $409,176
- 2019: $116,381
- 2020: $49,793
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Industry payments (Open Payments)
Industry payments (Open Payments) decreased 95% from $1,164.67 in 2019 to $56.99 in 2022.
- 2019: $1,164.67
- 2020: $180.69
- 2021: $77.89
- 2022: $56.99
Sources: CMS Medicare Physician & Other Practitioners (2020), CMS Medicare Part D Prescribers (2020), CMS Open Payments (2022), 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 2022 (payments made January 1 – December 31, 2022): fewer than 11 records totaling $56.99.
| Manufacturer | Payment Nature | Product | Type | Amount ($) |
|---|---|---|---|---|
| Janssen Pharmaceuticals, Inc |
Education
In-kind items and services
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STELARA | General | $56.99 |
Source: CMS Open Payments, program year 2022, 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 2016–2019 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, 2017–2020; 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 |
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96365
Infusion into a vein for therapy, prevention, or diagnosis, 1 hour or less
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92 | 88 | $250.00 | $66.62 |
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99214
Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more
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54 | 48 | $300.00 | $106.52 |
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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
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29 | 23 | $250.00 | $73.25 |
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45385
Removal of polyps or growths of large bowel using an endoscope with mechanical snare
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23 | 23 | $2500.00 | $434.84 |
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G0105
Colorectal cancer screening; colonoscopy on individual at high risk
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21 | 21 | $2000.00 | $318.37 |
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45378
Diagnostic exam of large bowel using a flexible endoscope
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16 | 16 | $2500.00 | $261.89 |
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43239
Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope
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14 | 13 | $2500.00 | $341.81 |
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44380
Diagnostic exam of small bowel using an endoscope inserted through surgically created opening from small bowel to skin
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11 | 11 | $2500.00 | $85.98 |
Source: CMS Part B by Provider and Service, 2020; 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 2020.
| Brand Name | Generic Name | Prescriptions | Day Supply | Total Cost | Patients |
|---|---|---|---|---|---|
| Omeprazole | Omeprazole | 93 | 4,689 | $1,322.72 | 30 |
| Pantoprazole Sodium | Pantoprazole Sodium | 42 | 2,160 | $529.83 | — |
| Linzess | Linaclotide | 39 | 1,620 | $23,778.87 | 11 |
| Famotidine | Famotidine | 38 | 1,540 | $332.26 | 11 |
| Ondansetron Hcl | Ondansetron Hcl | 37 | 111 | $57.25 | 36 |
| Sulfasalazine | Sulfasalazine | 25 | 1,290 | $1,386.19 | — |
| Mesalamine | Mesalamine | 24 | 710 | $13,678.37 | — |
| Metoclopramide Hcl | Metoclopramide Hcl | 21 | 870 | $83.68 | — |
| Esomeprazole Magnesium | Esomeprazole Magnesium | 19 | 690 | $1,660.29 | — |
| Ursodiol | Ursodiol | 13 | 690 | $5,740.49 | — |
| Budesonide Ec | Budesonide | 13 | 450 | $1,079.71 | — |
| Ranitidine Hcl | Ranitidine Hcl | 12 | 828 | $142.99 | — |
Source: CMS Part D by Provider and Drug, 2020; rows below 11 claims omitted by CMS; volume isn’t quality. Privacy limits
Specialties & License Numbers Reported to NPPES
NUCC Taxonomy Code: 174400000X
An individual educated and trained in an applied knowledge discipline used in the performance of work at a level requiring knowledge and skills beyond or apart from that provided by a general education or liberal arts degree.
Additional State Medicaid & Healthcare Payer Identifiers
Clinicians Sharing This Practice Address or Phone
Clinicians sharing this NPPES address, phone or fax; a shared contact does not mean they work together.
Physician Assistant - Medical
Physician Assistant (Certified)
Nurse Anesthetist, Certified Registered
Nurse Practitioner - Family
Nurse Practitioner
Nurse Anesthetist, Certified Registered
Certified Registered Nurse Anesthetist
Anesthesiology
Doctor of Medicine (M.D.)
Career & Practice History
NPI enumerated January 20, 2006.
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
Mailing Address
311 W Lincoln St, Suite 100
Belleville, IL 622201902
Phone: 6182333661