Dr. Mark James Lloyd London , MD
Surgery • Chicago, IL
5841 S Maryland Ave, Mc 5031, Dept Of Surgery
Chicago, IL 606371447
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 February 26, 2011; this date does not establish years in practice.
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Published CMS data list 346 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:
- 93990 — Ultrasound of hemodialysis access: 63 service units.
- 36821 — Relocation of arm vein with connection to arm artery for hemodialysis: 54 service units.
- 36830 — Creation of artery-vein connection using tube graft for hemodialysis: 44 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 11 records in the table · Guide: How to read Medicare Part B data
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Published CMS data list 380 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:
- Hydrocodone-Acetaminophen (Hydrocodone/Acetaminophen) — 325 prescription fills, including refills.
- Oxycodone-Acetaminophen (Oxycodone Hcl/Acetaminophen) — 34 prescription fills, including refills.
- Naloxone Hcl — 21 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 the full table · Guide: How to read Medicare Part D prescriber data
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More Medicare Part B services than 80% of clinicians listed under Surgery in Chicago, IL (2024, 125 clinicians with data). Median for this group: 128. Middle half: 61 to 283.
More Medicare Part B services than 65% of clinicians listed under Surgery in Illinois (2024, 574 clinicians with data). Median for this group: 234. Middle half: 104 to 407.
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 857 in 2020 to 346 in 2024.
Source: CMS, Medicare Physician & Other Practitioners – by Provider and Service, 2020–2024.
Practice Location & Contact Primary Location
5841 S Maryland Ave
Mc 5031, Dept Of Surgery
Chicago, IL 606371447
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: Musc Community Physicians. 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
2005
What Public CMS Data Show
Surgery: NPPES taxonomy is a reported classification, not proof of board certification.
Medicare patients
223 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 $120,140 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 $93,310 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
380 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
$3,574 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: $19,862.09 across 18 records.
By nature of payment (3 largest of 4)
- Consulting Fee: $13,920.00 across 4 records.
- Travel and Lodging: $4,067.16 across 3 records.
- Compensation for serving as faculty or as a speaker for a medical education program: $1,600.00 across 1 record.
Reporting-company totals (3 largest of 6)
- Merit Medical Systems Inc: $19,752.54 across 12 records.
- Bard Peripheral Vascular, Inc.: $33.79 across 2 records.
- Getinge USA Sales, LLC: $29.81 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
21 years (graduated 2005)
CMS Doctors and Clinicians data list 2005 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
2011
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. London 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. London 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 80% of clinicians listed under Surgery in Chicago, IL (2024, 125 clinicians with data). Median for this group: 128. Middle half: 61 to 283.
More Medicare Part B services than 65% of clinicians listed under Surgery in Illinois (2024, 574 clinicians with data). Median for this group: 234. Middle half: 104 to 407.
Medicare-allowed amount
A higher Medicare-allowed amount than 95% of clinicians listed under Surgery in Chicago, IL (2024, 125 clinicians with data). Median for this group: $16,609. Middle half: $6,202 to $44,149.
A higher Medicare-allowed amount than 90% of clinicians listed under Surgery in Illinois (2024, 574 clinicians with data). Median for this group: $32,979. Middle half: $12,408 to $58,178.
Paid by Medicare
A higher Medicare payment amount than 95% of clinicians listed under Surgery in Chicago, IL (2024, 125 clinicians with data). Median for this group: $12,574. Middle half: $4,744 to $34,419.
A higher Medicare payment amount than 90% of clinicians listed under Surgery in Illinois (2024, 574 clinicians with data). Median for this group: $24,820. Middle half: $9,412 to $45,065.
Medicare Part D prescriptions
More Part D prescriptions than 95% of clinicians listed under Surgery in Chicago, IL (2024, 94 clinicians with data). Median for this group: 26. Middle half: 14 to 77.
More Part D prescriptions than 95% of clinicians listed under Surgery in Illinois (2024, 510 clinicians with data). Median for this group: 53. Middle half: 24 to 122.
Part D drug cost
A higher Part D drug cost than 90% of clinicians listed under Surgery in Chicago, IL (2024, 94 clinicians with data). Median for this group: $161. Middle half: $54 to $600.
A higher Part D drug cost than 80% of clinicians listed under Surgery in Illinois (2024, 510 clinicians with data). Median for this group: $323. Middle half: $103 to $1,257.
549 active clinicians are listed under Surgery with a practice address in Chicago, IL (1,523 in Illinois).
Addresses are self-reported to NPPES and may be out of date.
Telehealth indicator in Chicago
5.1% of these 549 clinicians have the CMS telehealth indicator.
28.4% of these 549 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 60% from 857 in 2020 to 346 in 2024.
- 2020: 857
- 2021: 658
- 2022: 475
- 2023: 266
- 2024: 346
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Medicare-allowed amount
Medicare-allowed amount decreased 40% from $201,114 in 2020 to $120,140 in 2024.
- 2020: $201,114
- 2021: $209,798
- 2022: $165,595
- 2023: $104,107
- 2024: $120,140
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Paid by Medicare
Paid by Medicare decreased 41% from $158,729 in 2020 to $93,310 in 2024.
- 2020: $158,729
- 2021: $164,191
- 2022: $129,826
- 2023: $82,580
- 2024: $93,310
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Medicare Part D prescriptions
Medicare Part D prescriptions increased 51% from 252 in 2020 to 380 in 2024.
- 2020: 252
- 2021: 343
- 2022: 387
- 2023: 360
- 2024: 380
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30-day fills
30-day fills increased 51% from 252 in 2020 to 380 in 2024.
- 2020: 252
- 2021: 355
- 2022: 387
- 2023: 384
- 2024: 380
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Part D drug cost
Part D drug cost increased 54% from $2,324 in 2020 to $3,574 in 2024.
- 2020: $2,324
- 2021: $2,106
- 2022: $1,790
- 2023: $2,117
- 2024: $3,574
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Industry payments (Open Payments)
Industry payments (Open Payments) went from $294.37 in 2021 to $19,862.09 in 2025.
- 2021: $294.37
- 2022: $290.75
- 2023: $232.64
- 2024: $84.08
- 2025: $19,862.09
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): 18 records totaling $19,862.09.
| Manufacturer | Payment Nature | Product | Type | Amount ($) |
|---|---|---|---|---|
| Merit Medical Systems Inc |
Consulting Fee
Cash or cash equivalent
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— | General | $8,720.00 |
| Merit Medical Systems Inc |
Travel and Lodging
Cash or cash equivalent
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Wrapsody Stent Graft | General | $3,908.80 |
| Merit Medical Systems Inc |
Consulting Fee
Cash or cash equivalent
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Wrapsody Stent Graft | General | $3,200.00 |
| Merit Medical Systems Inc |
Consulting Fee
Cash or cash equivalent
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— | General | $1,600.00 |
| Merit Medical Systems Inc |
Compensation for serving as faculty or as a speaker for a medical education program
Cash or cash equivalent
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— | General | $1,600.00 |
| Merit Medical Systems Inc |
Consulting Fee
Cash or cash equivalent
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— | General | $400.00 |
| Merit Medical Systems Inc |
Food and Beverage
Cash or cash equivalent
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Wrapsody Stent Graft | General | $104.04 |
| Merit Medical Systems Inc |
Travel and Lodging
Cash or cash equivalent
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— | General | $95.36 |
| Merit Medical Systems Inc |
Travel and Lodging
Cash or cash equivalent
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Wrapsody Stent Graft | General | $63.00 |
| Merit Medical Systems Inc |
Food and Beverage
Cash or cash equivalent
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Wrapsody Stent Graft | General | $35.93 |
| Getinge USA Sales, LLC |
Food and Beverage
In-kind items and services
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FLIXENE | General | $29.81 |
| Merit Medical Systems Inc |
Food and Beverage
Cash or cash equivalent
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Wrapsody Stent Graft | General | $20.64 |
| Bard Peripheral Vascular, Inc. |
Food and Beverage
In-kind items and services
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LUTONIX Drug Coated Balloon | General | $20.02 |
| W. L. Gore & Associates, Inc. |
Food and Beverage
In-kind items and services
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GORE VIABAHN Endoprosthesis with Heparin | General | $16.19 |
| Stryker Corporation |
Food and Beverage
In-kind items and services
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INTHRILL THROMBECTOMY CATHETER | General | $15.65 |
| LeMaitre Vascular, Inc. |
Food and Beverage
Cash or cash equivalent
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ANASTOCLIP GC 8CM (MEDIUM) | General | $14.11 |
| Bard Peripheral Vascular, Inc. |
Food and Beverage
In-kind items and services
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LUTONIX Drug Coated Balloon | General | $13.77 |
| Merit Medical Systems Inc |
Food and Beverage
Cash or cash equivalent
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Wrapsody Stent Graft | General | $4.77 |
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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93990
Ultrasound of hemodialysis access
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63 | 48 | $98.48 | $22.10 |
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36821
Relocation of arm vein with connection to arm artery for hemodialysis
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54 | 53 | $4414.54 | $602.78 |
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36830
Creation of artery-vein connection using tube graft for hemodialysis
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44 | 43 | $5748.36 | $603.88 |
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36832
Revision of hemodialysis graft
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36 | 35 | $4280.00 | $647.66 |
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93985
Complete ultrasound of artery and vein blood flow pre-op assessment on both sides of body for hemodialysis access
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34 | 34 | $157.85 | $35.54 |
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49324
Insertion of abdominal cavity tube using an endoscope
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33 | 33 | $2578.27 | $348.75 |
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49325
Revision of abdominal cavity tube using an endoscope
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20 | 18 | $3473.05 | $370.10 |
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49422
Removal of abdominal cavity tube
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20 | 20 | $2273.00 | $175.94 |
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37607
Tying or banding of surgically created artery-vein connection
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19 | 17 | $2273.74 | $293.93 |
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36902
Insertion of needle and/or tube into hemodialysis circuit and balloon dilation of dialysis segment with review by radiologist
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12 | 12 | $4879.33 | $214.15 |
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36905
Removal and/or dissolving of blood clot in hemodialysis circuit and balloon dilation of dialysis segment with imaging review by radiologist, with balloon tube
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11 | 11 | $9183.82 | $410.79 |
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 |
|---|---|---|---|---|---|
| Hydrocodone-Acetaminophen | Hydrocodone/Acetaminophen | 325 | 1,004 | $2,136.55 | 253 |
| Oxycodone-Acetaminophen | Oxycodone Hcl/Acetaminophen | 34 | 118 | $220.81 | 29 |
| Naloxone Hcl | Naloxone Hcl | 21 | 148 | $1,216.48 | 21 |
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: 208600000X
A general surgeon has expertise related to the diagnosis - preoperative, operative and postoperative management - and management of complications of surgical conditions in the following areas: alimentary tract; abdomen; breast, skin and soft tissue; endocrine system; head and neck surgery; pediatric surgery; surgical critical care; surgical oncology; trauma and burns; and vascular surgery. General surgeons increasingly provide care through the use of minimally invasive and endoscopic techniques. Many general surgeons also possess expertise in transplantation surgery, plastic surgery and cardiothoracic surgery.
Medicare (PECOS) Enrollment & Ordering Eligibility
Source: CMS PECOSPRACTITIONER - GENERAL SURGERY
I20170424001386
SC
8628221678
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
Musc Community Physicians
3000 Saint Matthews Rd, Orangeburg, SC 291181442
Phone: 8033953400
Musc Community Physicians
506 N St, Bamberg, SC 290031319
Phone: 8032456290
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
Doctor of Medicine (M.D.)
Hospitalist
Doctor of Medicine (M.D.)
Pediatrics - Pediatric Hematology-Oncology
Internal Medicine - Gastroenterology
Doctor of Medicine (M.D.)
Nurse Practitioner - Primary Care
Adult-Gerontology Nurse Practitioner (Certified)
Internal Medicine
MDMS
Career & Practice History
NPI enumerated February 26, 2011.
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 Surgery Specialists in Chicago
- Dr. Howard Federer, MD
- Dr. Richard Olen, MD
- Dr. Jennifer Jolley, MD
- Dr. Antonio Gangemi, MD
- Dr. Cheryl Hornsby, MD
- Dr. Airiel Bouie, MD
Mailing Address
Po Box 3582
Palmer, AK 996453582
Phone: 2078071433