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Dr. Marcellus Andre Walker, MD
NPI1003038274PAC ID5395929830
- Medicare services, 2024
- 600
- Medicare patients, 2024
- 352
- Part D claims, 2024
- 722
- Clinical trials
- 10
- MIPS score, 2024
- 86
- Practice address
- 138 Delancey St, New York, NY 10002-3325
- Practice phone
- Call (212) 609-2541
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Citymd Urgent Care
Urgent care · New York, New York
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Dr. Marcellus Andre Walker is an internist in New York, New York
Dr. Walker practices at Citymd Urgent Care in New York, New York.
Dr. Walker's NPI, 1003038274, was assigned on May 3, 2007. Dr. Walker graduated from University of Illinois College of Medicine at Chicago in 1984. Dr. Walker holds New York license 189578A.
NPI and contact details
- NPI
- 1003038274NPI Registry (opens in a new tab)
- Medicare PAC ID
- 5395929830
- NPI enumeration date
- May 3, 2007
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (212) 609-2541
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 74
- Medical school graduation
- 1984
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Marcellus Andre Walker practices at Citymd Urgent Care in New York, New York
Dr. Walker's primary practice is Citymd Urgent Care, at 138 Delancey St, New York, NY 10002-3325. The practice phone is (212) 609-2541.
- Citymd Urgent Care138 Delancey St, New York, NY 10002-3325Phone(212) 609-2541
Source: Doctors and Clinicians National Downloadable File (CMS)
Dr. Marcellus Andre Walker is affiliated with 1 site of care and 2 medical groups
Dr. Walker's primary practice is Citymd Urgent Care in New York, New York. The medical group on file is CityMD. Dmand AI also links Dr. Walker to 1 more medical group, named with a free account.
Sources: Doctors and Clinicians National Downloadable File (CMS); and Dmand AI Affiliation Data
Dmand AI tracks the EHR system at Dr. Marcellus Andre Walker's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Walker practices. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Citymd Urgent Care | Available with a free account |
| +1 medical group | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Marcellus Andre Walker is one of 9,643 internists in New York
Internal medicine is Dr. Walker's primary specialty in the NPI Registry, under taxonomy code 207R00000X. Dr. Walker is board certified in internal medicine by the American Board of Internal Medicine. Dmand AI has Dr. Walker's licenses on file in 2 states: New York and Pennsylvania.
Specialties and state licenses
- Internal medicine, New YorkPrimary
- Pennsylvania license
Internists near Dr. Walker
Counts of internists with a Dmand AI profile, by place and practice. Each opens the list.
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Dr. Marcellus Andre Walker billed Medicare for 600 services in 2024
CMS data shows 600 Medicare services from Dr. Walker across 10 procedure codes in 2024, for 352 Medicare patients. Medicare paid $38,468 for them. Every service was in an office.
Medicare services, 2024600
Medicare patients352
Paid by Medicare$38,468
Procedure codes10
Dr. Walker's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 2822024: 39741%
- Lab and pathology
- 2023: 2232024: 17920%
- Imaging
- 2023: 132024: 128%
- Surgery
- 2023: 02024: 12
Dr. Walker compared with the New York median for internists, 2024
- Dr. Walker
- New York median
- Medicare services
- 600vs 42641% above
- Medicare patients
- 352vs 1582.2 times
- Part D claims
- 548vs 62212% below
Medians across 9,428 internists in New York with Dmand AI profiles that report each measure.
Dr. Walker's most billed Medicare procedure codes, 2024
CMS publishes codes billed for 11 or more Medicare patients. Each label is the code family; CPT descriptions are licensed by the AMA.
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Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Marcellus Andre Walker treated 352 Medicare patients in 2024, average age 76
CMS counts 352 Medicare patients who saw Dr. Walker in 2024. The largest group is 75 to 84, with 162 patients. 75% of them have high cholesterol, and 63% have high blood pressure. 11% are also on Medicaid. Their average risk score is 1.03, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Dr. Walker's median patient age at 34, with 53% women.
Medicare patients, 2024352
Average age76
Average risk score1.03
Also on Medicaid11%
Dr. Walker's Medicare patients by age, 2024
Dr. Walker's Medicare patients by sex, 2024
- Women24168%
- Men11132%
Chronic conditions among Dr. Walker's Medicare patients, 2024
- High cholesterol75%
- High blood pressure63%
- Arthritis50%
- Ischemic heart disease34%
- Osteoporosis32%
- Anxiety27%
- Mood disorders24%
- Cancer20%
Share of Medicare patients with each condition. A patient can have several.
Dr. Walker's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 34
Patient panel by sex, all payers
- Women53%
- Men43%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Marcellus Andre Walker wrote 722 Medicare Part D claims in 2024
In 2024, Dr. Walker wrote 722 Medicare Part D claims for 361 patients. 90% of them were for generic drugs. CMS names the drug for 548 of them, across 18 drugs with 11 or more claims each, at $8,243 in total drug cost. In 2023, CMS named 242 claims across 7 drugs.
Part D claims, 2024722
Drugs named by CMS18
Total drug cost$8,243
Part D patients361
Dr. Walker's Part D claims by kind of drug, 2024
- Generic650 claims90%
- Brand-name and other72 claims10%
Dr. Walker's most prescribed drugs by claims, 2024
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Drug classes CMS tracks in Dr. Walker's Part D claims, 2024
- Antibiotics31%226 of 722 claims
Share of all Part D claims for each drug class CMS reports on. Classes with no claims are left out.
Part D claims for drugs CMS names, 2023 to 2024
- 2023
- 2024
- Claims for drugs CMS names
- 2023: 2422024: 548126%
Drugs named by CMS: 18 in 2024, 7 in 2023.
Sources: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026; and Medicare Part D Prescribers - by Provider (CMS), 2024 data
Dr. Marcellus Andre Walker scored 86 out of 100 in Medicare's MIPS program for 2024
CMS publishes a Merit-based Incentive Payment System (MIPS) score of 86 out of 100 for Dr. Walker for performance year 2024, reported as part of a group. Dr. Walker accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
Dr. Walker's MIPS scores, performance year 2024
- 86of 100Final score
- 82.1of 100Quality
- 100of 100Promoting Interoperability
- 40of 100Improvement Activities
- 72of 100Cost
Each score is out of 100. The final score weighs the categories CMS scored for this clinician.
Sources: Doctors and Clinicians National Downloadable File (CMS); and Clinician Public Reporting: Overall MIPS Performance (CMS), 2024 data, released September 10, 2026
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Dr. Marcellus Andre Walker has worked on 10 clinical trials
Dmand AI links Dr. Walker to 10 clinical trials, 4 of them phase 2 studies. 9 are still active or recruiting. Conditions studied include Adenocarcinoma of Lung, Biliary Atresia and Low Back Pain.
Clinical trials with Dr. Walker by phase
- NonePhase 1: no trials
- 4Phase 2: 4 trials
- 1Phase 2/3: 1 trial
- NonePhase 3: no trials
- NonePhase 4: no trials
Trials with no phase (devices, behavioral studies) are left out.
Conditions in Dr. Walker's trials
- Adenocarcinoma of Lung
- Biliary Atresia
- Low Back Pain
- Malocclusion
- Muscular Atrophy
Investigators on the most trials with Dr. Walker
- Kader Tawfiq Abdelerahman, MD10 shared trials
- Randa Abdelmasih, MD10 shared trials
- Marjorie E. Affel, MD10 shared trials
Recent clinical trials with Dr. Walker
Adenocarcinoma of LungAdenocarcinoma
Sources: ClinicalTrials.gov (National Library of Medicine); and Dmand AI Research Linkage
Dr. Marcellus Andre Walker received $466 in industry payments from 2017 to 2020
CMS Open Payments shows 9 general payments to Dr. Walker from 3 drug and device companies from 2017 to 2020. Food and beverage make up the largest share, 94% of the total. Alkermes, Inc. paid the most, $248.
General payments to Dr. Walker by program year, 2017 to 2020
General payments to Dr. Walker by kind, 2017 to 2020
$466in total
- Food and beverage$44194%
- Education$266%
Companies that paid Dr. Walker the most, 2017 to 2020
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Marcellus Andre Walker graduated from University of Illinois College of Medicine at Chicago
Dr. Walker graduated from University of Illinois College of Medicine at Chicago in 1984.
- Medical school
- Board certified in internal medicine
Source: Dmand AI Professional Profile Data
Sources for Dr. Marcellus Andre Walker's profile data
Data last refreshed October 2026Report an inaccuracyRemove my information
FAQ
Frequently asked questions about Dr. Marcellus Andre Walker
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Dr. Marcellus Andre Walker's NPI number?
Dr. Marcellus Andre Walker's NPI number is 1003038274. It was assigned on May 3, 2007, and it is active in the NPI Registry.
What kind of doctor is Dr. Marcellus Andre Walker?
Dr. Marcellus Andre Walker is an internist in New York, New York. The primary specialty in the NPI Registry is Internal Medicine Physician (taxonomy code 207R00000X).
Where does Dr. Marcellus Andre Walker practice?
Dr. Walker practices at 138 Delancey St, New York, NY 10002-3325. Dr. Walker's primary practice is Citymd Urgent Care in New York, New York. Dmand AI also links Dr. Walker to 1 medical group.
What is Dr. Marcellus Andre Walker's office phone number?
The practice phone on file for Dr. Walker is (212) 609-2541.
What is Dr. Marcellus Andre Walker's medical license number?
Dr. Walker holds New York license 189578A, one of the licenses on file in 2 states.
Which states has Dr. Marcellus Andre Walker been licensed in?
Dmand AI has state licenses on file for Dr. Walker in New York and Pennsylvania.
What medical group is Dr. Marcellus Andre Walker part of?
Dr. Walker is linked to CityMD. Dmand AI links Dr. Walker to 1 more medical group.
Does Dr. Marcellus Andre Walker accept Medicare?
Yes. CMS data shows Dr. Walker billed Medicare for 600 services in 2024, and Dr. Walker accepts Medicare assignment.
What is Dr. Marcellus Andre Walker's MIPS score?
Dr. Walker's MIPS final score for performance year 2024 is 86 out of 100, reported as part of a group.
How many Medicare patients does Dr. Marcellus Andre Walker see?
CMS counts 352 Medicare patients who saw Dr. Walker in 2024, with an average age of 76.
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Is Dr. Marcellus Andre Walker board certified?
Yes. Dr. Walker is board certified in internal medicine by the American Board of Internal Medicine.
What services does Dr. Marcellus Andre Walker bill to Medicare?
In 2024, Dr. Walker's most billed Medicare services were office visit, established patient (99213), lab and pathology test (87428) and office visit, established patient (99214).
Where did Dr. Marcellus Andre Walker go to medical school?
Dr. Walker graduated from University of Illinois College of Medicine at Chicago in 1984.
What drugs does Dr. Marcellus Andre Walker prescribe most?
In 2024 Medicare Part D data, Dr. Walker's most prescribed drugs by claims were Azelastine HCl, Doxycycline Monohydrate and Fluticasone Propionate.
Has Dr. Marcellus Andre Walker received payments from drug or device companies?
CMS Open Payments shows $466 in general payments to Dr. Walker from 3 companies from 2017 to 2020. The largest total came from Alkermes, Inc.
How long has Dr. Marcellus Andre Walker been practicing?
Dr. Walker graduated from medical school in 1984, 42 years ago.
Does Dr. Marcellus Andre Walker do research?
Dr. Walker has worked on 10 clinical trials.
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