Dr. Marc Stephen Posner, MD
- Medicare services, 2024
- 661
- Medicare patients, 2024
- 108
- Part D claims, 2024
- 2,678
- Industry payments
- $2,597
- Affiliated sites
- 2
- Practice address
- 20 W West St, Baltimore, MD 21230
- Practice phone
- Call (410) 752-2262
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Downtown Baltimore Surgery Center, LLC
Baltimore, Maryland
Find Dr. Posner's professional email, personal email and mobile number
Dmand AI checks each channel through healthcare-specific waterfall enrichment. See what is on file with a free account, with practice phones, licenses and affiliations.
Dr. Marc Stephen Posner is a family medicine physician in Baltimore, Maryland
Dr. Posner practices at Downtown Baltimore Surgery Center, LLC in Baltimore, Maryland.
Dr. Posner's NPI, 1114930211, was assigned on August 14, 2006. Dr. Posner graduated from University of Maryland School of Medicine in 1976. Dr. Posner holds Maryland license D19640.
- NPI
- 1114930211NPI Registry (opens in a new tab)
- Medicare PAC ID
- 2062601099
- NPI enumeration date
- August 14, 2006
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (410) 752-2262
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 76
- Medical school graduation
- 1976
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Practice Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Marc Stephen Posner practices at Downtown Baltimore Surgery Center, LLC in Baltimore, Maryland
Dr. Posner's primary practice is Downtown Baltimore Surgery Center, LLC, at 20 W West St, Baltimore, MD 21230 in Baltimore City. The practice phone is (410) 752-2262.
- Downtown Baltimore Surgery Center, LLC20 W West St, Baltimore, MD 21230 · Baltimore CityPhone(410) 752-2262
Sources: NPPES NPI Registry (CMS); and Dmand AI Practice Data
Dr. Marc Stephen Posner is affiliated with 3 sites of care and 1 medical group
Dr. Posner's primary practice is Downtown Baltimore Surgery Center, LLC in Baltimore, Maryland. The medical group on file is Righttime Medical Care. Dmand AI also links Dr. Posner to 1 more physician office and 1 group practice or clinic, each named with a free account.
Sources: NPPES NPI Registry (CMS); Dmand AI Practice Data; and Dmand AI Affiliation Data
Dmand AI tracks the EHR system at Dr. Marc Stephen Posner's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Posner practices, 2 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Downtown Baltimore Surgery Center, LLC | Available with a free account |
| +2 more affiliated sites | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Marc Stephen Posner is one of 1,698 family medicine physicians in Maryland
Family medicine is Dr. Posner's primary specialty in the NPI Registry, under taxonomy code 207Q00000X. Dr. Posner is licensed in Maryland.
Specialties and state licenses
- Family medicine, MarylandPrimary
Family medicine physicians near Dr. Posner
Counts of family medicine physicians 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. Marc Stephen Posner billed Medicare for 661 services in 2024
CMS data shows 661 Medicare services from Dr. Posner across 5 procedure codes in 2024, for 108 Medicare patients. Medicare paid $40,009 for them. Every service was in an office.
Dr. Posner's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 4382024: 4282%
- Other services
- 2023: 872024: 218151%
- Tests and treatments
- 2023: 212024: 1529%
Dr. Posner compared with the Maryland median for family medicine physicians, 2024
- Dr. Posner
- Maryland median
- Medicare services
- 661vs 51628% above
- Medicare patients
- 108vs 20848% below
- Part D claims
- 2,141vs 7512.9 times
Medians across 1,659 family medicine physicians in Maryland with Dmand AI profiles that report each measure.
Dr. Posner'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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Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Posner and other family medicine physicians in Maryland.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Marc Stephen Posner treated 108 Medicare patients in 2024, average age 70
CMS counts 108 Medicare patients who saw Dr. Posner in 2024. The largest group is 65 to 74, with 49 patients. 75% of them have high blood pressure, and 75% have high cholesterol. 42% are also on Medicaid. Their average risk score is 1.26, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Dr. Posner's median patient age at 61, with 37% women.
Dr. Posner's Medicare patients by age, 2024
CMS leaves out age groups with fewer than 11 patients.
Dr. Posner's Medicare patients by sex, 2024
- Women4844%
- Men6056%
Chronic conditions among Dr. Posner's Medicare patients, 2024
- High blood pressure75%
- High cholesterol75%
- Arthritis45%
- Diabetes36%
- COPD31%
- Ischemic heart disease30%
- Anxiety26%
- Asthma25%
Share of Medicare patients with each condition. A patient can have several.
Dr. Posner's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 61
Patient panel by sex, all payers
- Women37%
- Men63%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Marc Stephen Posner wrote 2,678 Medicare Part D claims in 2024
In 2024, Dr. Posner wrote 2,678 Medicare Part D claims for 161 patients. 83% of them were for generic drugs. CMS names the drug for 2,141 of them, across 60 drugs with 11 or more claims each, at $252,824 in total drug cost. In 2023, CMS named 1,962 claims across 54 drugs.
Dr. Posner's Part D claims by kind of drug, 2024
- Generic2,220 claims83%
- Brand-name and other458 claims17%
Dr. Posner'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. Posner's Part D claims, 2024
- Antibiotics5%123 of 2,678 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: 1,9622024: 2,1419%
Drugs named by CMS: 60 in 2024, 54 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
How Dr. Marc Stephen Posner takes part in Medicare
Dr. Posner accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
Source: Doctors and Clinicians National Downloadable File (CMS)
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Dr. Marc Stephen Posner received $2,597 in industry payments from 2016 to 2025
CMS Open Payments shows 143 general payments to Dr. Posner from 20 drug and device companies from 2016 to 2025. Food and beverage make up the largest share, 100% of the total. GlaxoSmithKline, LLC. paid the most, $878.
General payments to Dr. Posner by program year, 2016 to 2025
Companies that paid Dr. Posner the most, 2016 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Marc Stephen Posner graduated from University of Maryland School of Medicine
Dr. Posner graduated from University of Maryland School of Medicine in 1976.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. Marc Stephen Posner's profile data
| Data on this page | Source |
|---|---|
| NPI, name, sex, specialty and licenses | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data |
| Practice locations and phone | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice Data |
| Primary practice, affiliations and health system | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice DataDmand AI Affiliation Data |
| Medicare services and procedure codes | Medicare Physician & Other Practitioners - by Provider and Service (CMS) (opens in a new tab) |
| State medians for the same specialty | Dmand AI Peer Benchmarks |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel DataMedicare Physician & Other Practitioners - by Provider (CMS) (opens in a new tab) |
| Part D prescribing | Medicare Part D Prescribers - by Provider and Drug (CMS) (opens in a new tab)Medicare Part D Prescribers - by Provider (CMS) (opens in a new tab) |
| MIPS scores, telehealth, assignment and procedure percentiles | Doctors and Clinicians National Downloadable File (CMS) (opens in a new tab) |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| Training, board certification and memberships | Dmand AI Professional Profile Data |
| EHR at each practice site | Dmand AI Technology Install Data |
| Similar physicians | Dmand AI Affiliation Data |
Data last refreshed October 2026Report an inaccuracyRemove my information
FAQ
Frequently asked questions about Dr. Marc Stephen Posner
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. Marc Stephen Posner's NPI number?
Dr. Marc Stephen Posner's NPI number is 1114930211. It was assigned on August 14, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. Marc Stephen Posner?
Dr. Marc Stephen Posner is a family medicine physician in Baltimore, Maryland. The primary specialty in the NPI Registry is Family Medicine Physician (taxonomy code 207Q00000X).
Where does Dr. Marc Stephen Posner practice?
Dr. Posner practices at 20 W West St, Baltimore, MD 21230. Dr. Posner's primary practice is Downtown Baltimore Surgery Center, LLC in Baltimore, Maryland. Dmand AI also links Dr. Posner to 1 physician office and 1 group practice or clinic.
What is Dr. Marc Stephen Posner's office phone number?
The practice phone on file for Dr. Posner is (410) 752-2262.
What is Dr. Marc Stephen Posner's medical license number?
Dr. Posner holds Maryland license D19640.
What medical group is Dr. Marc Stephen Posner part of?
Dr. Posner is linked to Righttime Medical Care.
Does Dr. Marc Stephen Posner accept Medicare?
Yes. CMS data shows Dr. Posner billed Medicare for 661 services in 2024, and Dr. Posner accepts Medicare assignment.
How many Medicare patients does Dr. Marc Stephen Posner see?
CMS counts 108 Medicare patients who saw Dr. Posner in 2024, with an average age of 70.
What services does Dr. Marc Stephen Posner bill to Medicare?
In 2024, Dr. Posner's most billed Medicare services were office visit, established patient (99214), medicare service (G2211) and medicare service (G0439).
Where did Dr. Marc Stephen Posner go to medical school?
Dr. Posner graduated from University of Maryland School of Medicine in 1976.
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What drugs does Dr. Marc Stephen Posner prescribe most?
In 2024 Medicare Part D data, Dr. Posner's most prescribed drugs by claims were Atorvastatin Calcium, Trelegy Ellipta and Albuterol Sulfate Hfa.
Has Dr. Marc Stephen Posner received payments from drug or device companies?
CMS Open Payments shows $2,597 in general payments to Dr. Posner from 20 companies from 2016 to 2025. The largest total came from GlaxoSmithKline, LLC.
How long has Dr. Marc Stephen Posner been practicing?
Dr. Posner graduated from medical school in 1976, 50 years ago.
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