Dr. Marc Singer , MD
Colon & Rectal Surgery • Chicago, IL
1740 W Taylor St, Dept 3449
Chicago, IL 606127232
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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Dr. Marc Singer is listed in NPPES under Colon & Rectal Surgery.
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NPI assigned on August 2, 2006; this date does not establish years in practice.
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Published CMS data list 356 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:
- 99213 — Established patient outpatient office visit: 117 service units.
- 99233 — Subsequent hospital care with moderate levelof medical decision making: 53 service units.
- 99203 — New patient outpatient office visit: 40 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 10 records in the table · Guide: How to read Medicare Part B data
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Published CMS data list 162 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:
- Sod Sulf-Potass Sulf-Mag Sulf (Sodium, Potassium,mag Sulfates) — 54 prescription fills, including refills.
- Metronidazole — 38 prescription fills, including refills.
- Neomycin Sulfate — 37 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 5 records in the table · Guide: How to read Medicare Part D prescriber data
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More Medicare Part B services than 95% of clinicians listed under Colon & Rectal Surgery in Chicago, IL (2024, 22 clinicians with data). Median for this group: 134. Middle half: 67 to 240.
More Medicare Part B services than 70% of clinicians listed under Colon & Rectal Surgery in Illinois (2024, 65 clinicians with data). Median for this group: 241. Middle half: 127 to 359.
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 257 in 2020 to 356 in 2024.
Source: CMS, Medicare Physician & Other Practitioners – by Provider and Service, 2020–2024.
Practice Location & Contact Primary Location
1740 W Taylor St
Dept 3449
Chicago, IL 606127232
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 2 distinct group names: Chesterton Physical Therapy Inc; Loyola University Medical Center. 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
University Of Illinois College Of Med (Chi/peor/rock/chm-Urb)
1997
What Public CMS Data Show
Colon & Rectal Surgery: NPPES taxonomy is a reported classification, not proof of board certification.
Medicare patients
222 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 $31,804 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 $23,545 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
162 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
$5,005 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: $931.75 across 7 records.
By nature of payment
- Food and Beverage: $471.75 across 6 records.
- Consulting Fee: $460.00 across 1 record.
Reporting-company totals
- Ethicon Inc.: $846.05 across 6 records.
- Solventum Corporation: $85.70 across 1 record.
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
29 years (graduated 1997)
CMS Doctors and Clinicians data list 1997 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
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.
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?”
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.
Enrolled in Medicare (PECOS)
Dr. Singer 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 Dr. Singer 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 Chicago and Illinois
Billing and prescribing volume is not a quality rating.
Medicare Part B services
More Medicare Part B services than 95% of clinicians listed under Colon & Rectal Surgery in Chicago, IL (2024, 22 clinicians with data). Median for this group: 134. Middle half: 67 to 240.
More Medicare Part B services than 70% of clinicians listed under Colon & Rectal Surgery in Illinois (2024, 65 clinicians with data). Median for this group: 241. Middle half: 127 to 359.
Medicare-allowed amount
A higher Medicare-allowed amount than 80% of clinicians listed under Colon & Rectal Surgery in Chicago, IL (2024, 22 clinicians with data). Median for this group: $14,312. Middle half: $5,702 to $28,071.
Close to the middle for clinicians listed under Colon & Rectal Surgery in Illinois (2024, 65 clinicians with data). Median for this group: $26,009. Middle half: $13,162 to $45,581.
Paid by Medicare
A higher Medicare payment amount than 80% of clinicians listed under Colon & Rectal Surgery in Chicago, IL (2024, 22 clinicians with data). Median for this group: $10,982. Middle half: $4,093 to $21,456.
Close to the middle for clinicians listed under Colon & Rectal Surgery in Illinois (2024, 65 clinicians with data). Median for this group: $20,342. Middle half: $10,079 to $35,541.
Medicare Part D prescriptions
More Part D prescriptions than 75% of clinicians listed under Colon & Rectal Surgery in Chicago, IL (2024, 24 clinicians with data). Median for this group: 51. Middle half: 32 to 137.
More Part D prescriptions than 75% of clinicians listed under Colon & Rectal Surgery in Illinois (2024, 66 clinicians with data). Median for this group: 111. Middle half: 38 to 160.
Part D drug cost
A higher Part D drug cost than 95% of clinicians listed under Colon & Rectal Surgery in Chicago, IL (2024, 24 clinicians with data). Median for this group: $665. Middle half: $139 to $2,084.
A higher Part D drug cost than 80% of clinicians listed under Colon & Rectal Surgery in Illinois (2024, 66 clinicians with data). Median for this group: $1,200. Middle half: $431 to $3,556.
44 active clinicians are listed under Colon & Rectal Surgery with a practice address in Chicago, IL (97 in Illinois).
Addresses are self-reported to NPPES and may be out of date.
Telehealth indicator in Chicago
22.7% of these 44 clinicians have the CMS telehealth indicator.
63.6% of these 44 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 increased 39% from 257 in 2020 to 356 in 2024.
- 2020: 257
- 2021: 410
- 2022: 398
- 2023: 332
- 2024: 356
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Medicare-allowed amount
Medicare-allowed amount increased 63% from $19,514 in 2020 to $31,804 in 2024.
- 2020: $19,514
- 2021: $38,046
- 2022: $35,662
- 2023: $28,372
- 2024: $31,804
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Paid by Medicare
Paid by Medicare increased 62% from $14,571 in 2020 to $23,545 in 2024.
- 2020: $14,571
- 2021: $28,539
- 2022: $27,082
- 2023: $20,574
- 2024: $23,545
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Medicare Part D prescriptions
Medicare Part D prescriptions increased 105% from 79 in 2020 to 162 in 2024.
- 2020: 79
- 2021: 108
- 2022: 106
- 2023: 135
- 2024: 162
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30-day fills
30-day fills increased 105% from 79 in 2020 to 162 in 2024.
- 2020: 79
- 2021: 108
- 2022: 106
- 2023: 146
- 2024: 162
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Part D drug cost
Part D drug cost increased 21% from $4,134 in 2020 to $5,005 in 2024.
- 2020: $4,134
- 2021: $6,314
- 2022: $6,928
- 2023: $7,508
- 2024: $5,005
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Industry payments (Open Payments)
Industry payments (Open Payments) decreased 96% from $24,144.89 in 2021 to $931.75 in 2025.
- 2021: $24,144.89
- 2022: $38,005.88
- 2023: $34,746.91
- 2024: $5,171.91
- 2025: $931.75
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): fewer than 11 records totaling $931.75.
| Manufacturer | Payment Nature | Product | Type | Amount ($) |
|---|---|---|---|---|
| Ethicon Inc. |
Consulting Fee
Cash or cash equivalent
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CONTOUR | General | $460.00 |
| Ethicon Inc. |
Food and Beverage
In-kind items and services
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Echelon Circular | General | $150.00 |
| Ethicon Inc. |
Food and Beverage
In-kind items and services
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ETHICON | General | $105.12 |
| Solventum Corporation |
Food and Beverage
Cash or cash equivalent
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PREVENA | General | $85.70 |
| Ethicon Inc. |
Food and Beverage
In-kind items and services
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Echelon; Endopath | General | $53.69 |
| Ethicon Inc. |
Food and Beverage
In-kind items and services
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Echelon; Endopath | General | $39.86 |
| Ethicon Inc. |
Food and Beverage
In-kind items and services
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Echelon Flex | General | $37.38 |
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 |
|---|---|---|---|---|
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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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117 | 74 | $286.00 | $67.68 |
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99233
Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes
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53 | 18 | $488.00 | $121.86 |
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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
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40 | 40 | $352.00 | $85.94 |
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99212
Established patient office or other outpatient visit with straightforward medical decision making, if using time, 10 minutes or more
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35 | 31 | $166.00 | $36.68 |
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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
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26 | 26 | $572.00 | $135.50 |
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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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26 | 16 | $286.00 | $67.05 |
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45378
Diagnostic exam of large bowel using a flexible endoscope
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19 | 18 | $1325.00 | $184.29 |
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46600
Diagnostic exam of anus using an endoscope
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16 | 14 | $386.00 | $44.01 |
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99223
Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes
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13 | 13 | $711.00 | $177.75 |
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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
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11 | 11 | $352.00 | $83.89 |
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 |
|---|---|---|---|---|---|
| Sod Sulf-Potass Sulf-Mag Sulf | Sodium, Potassium,mag Sulfates | 54 | 60 | $3,684.29 | 52 |
| Metronidazole | Metronidazole | 38 | 49 | $55.32 | 37 |
| Neomycin Sulfate | Neomycin Sulfate | 37 | 41 | $189.55 | 36 |
| Gavilyte-G | Peg3350/Sod Sulf,bicarb,cl/Kcl | 18 | 18 | $262.52 | 18 |
| Sodium Chloride | 0.9 % Sodium Chloride | 15 | 107 | $813.24 | — |
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: 2021-05-04NUCC Taxonomy Code: 208C00000X
A colon and rectal surgeon is trained to diagnose and treat various diseases of the intestinal tract, colon, rectum, anal canal and perianal area by medical and surgical means. This specialist also deals with other organs and tissues (such as the liver, urinary and female reproductive system) involved with primary intestinal disease.
Medicare (PECOS) Enrollment & Ordering Eligibility
Source: CMS PECOSPRACTITIONER - COLORECTAL SURGERY (PROCTOLOGY)
I20061018000560
IL
7315943172
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
Chesterton Physical Therapy Inc
425 Sand Creek Dr, Chesterton, IN 463041589
Loyola University Medical Center
2160 S 1st Ave, Maywood, IL 601533328
Phone: 7082169000
Clinicians Sharing This Practice Address or Phone
Clinicians sharing this NPPES address, phone or fax; a shared contact does not mean they work together.
Colon & Rectal Surgery
Doctor of Medicine (M.D.)
Internal Medicine
Doctor of Medicine (M.D.)
Emergency Medicine
Doctor of Medicine (M.D.)
Clinical Neuropsychologist
Doctor of Philosophy (Ph.D.)
Internal Medicine - Nephrology
Doctor of Medicine (M.D.)
Internal Medicine - Hematology & Oncology
Doctor of Medicine (M.D.)
Career & Practice History
NPI enumerated August 02, 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
Other Colon & Rectal Surgery Specialists in Chicago
- Gerald Gantt
- Dr. Jared Emolo, MD
- Dr. Scott Strong, MD
- Dr. Theodore Saclarides, MD
- Dr. Ariane Abcarian, MD
- Brian Brajcich
Mailing Address
200 Adams St, Suite 225
Chicago, IL 606065212
Phone: 3127042885