Cerebral CortexGray MatterMagnetic Resonance Imaging
Dr. Mark Stephan Ostrem, MD
NPI1811985633PAC ID6305803958
- Medicare services, 2024
- 2,002
- Medicare patients, 2024
- 215
- Part D claims, 2024
- 16,508
- Publications
- 2
- Hospital affiliations
- 3
- Practice address
- 2 Seaport Drive, Quincy, MA 02171
- Practice phone
- Call (617) 769-5106
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Alliance Health at Marina Bay
Skilled Nursing Facility · Quincy, Massachusetts
Find Dr. Ostrem'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. Mark Stephan Ostrem is a geriatric medicine (internal medicine) physician in Quincy, Massachusetts
Dr. Ostrem practices at Alliance Health at Marina Bay in Quincy, Massachusetts.
Dr. Ostrem's NPI, 1811985633, was assigned on October 6, 2005. Dr. Ostrem graduated from University of Minnesota Medical School in 1976. Dr. Ostrem holds Massachusetts license 44501.
NPI and contact details
- NPI
- 1811985633NPI Registry (opens in a new tab)
- Medicare PAC ID
- 6305803958
- NPI enumeration date
- October 6, 2005
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (617) 769-5106
- 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 Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Mark Stephan Ostrem practices at Alliance Health at Marina Bay in Quincy, Massachusetts
Dr. Ostrem's primary practice is Alliance Health at Marina Bay, at 2 Seaport Drive, Quincy, MA 02171 in Norfolk County. The practice phone is (617) 769-5106.
- Alliance Health at Marina Bay2 Seaport Drive, Quincy, MA 02171 · Norfolk CountyPhone(617) 769-5106
Source: Dmand AI Affiliation Data
Dr. Mark Stephan Ostrem is affiliated with 11 sites of care and 4 medical groups
Dr. Ostrem's primary practice is Alliance Health at Marina Bay in Quincy, Massachusetts. Dr. Ostrem is also affiliated with Brigham and Women's Faulkner Hospital. The medical group on file is Steward Medical Group. Dmand AI also links Dr. Ostrem to 2 more hospitals, 4 group practices and clinics, 3 medical groups, 2 skilled nursing facilities and 1 hospice, each named with a free account.
Alliance Health at Marina BayPrimary
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Mark Stephan Ostrem's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Ostrem practices, 11 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Alliance Health at Marina Bay | Available with a free account |
| +10 more sites and 3 medical groups | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Mark Stephan Ostrem is one of 169 geriatric medicine (internal medicine) physicians in Massachusetts
Geriatric medicine is Dr. Ostrem's primary specialty in the NPI Registry, under taxonomy code 207RG0300X. Dr. Ostrem is licensed in Massachusetts.
Specialties and state licenses
- Geriatric medicine (internal medicine), MassachusettsPrimary
Geriatric medicine (internal medicine) physicians near Dr. Ostrem
Counts of geriatric medicine (internal medicine) physicians with a Dmand AI profile, by place and practice. Each opens the list.
169geriatric medicine (internal medicine) physicians in Massachusetts
3geriatric medicine (internal medicine) physicians in Quincy
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Dr. Mark Stephan Ostrem billed Medicare for 2,002 services in 2024
CMS data shows 2,002 Medicare services from Dr. Ostrem across 8 procedure codes in 2024, for 215 Medicare patients. Medicare paid $165,612 for them.
Medicare services, 20242,002
Medicare patients215
Paid by Medicare$165,612
Procedure codes8
Dr. Ostrem's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 2,2562024: 1,98112%
- Other services
- 2023: 02024: 21
Where Dr. Ostrem's Medicare services took place, 2024
- In an office1,05753%
- In a facility94547%
Dr. Ostrem compared with the Massachusetts median for geriatric medicine (internal medicine) physicians, 2024
- Dr. Ostrem
- Massachusetts median
- Medicare services
- 2,002vs 4194.8 times
- Medicare patients
- 215vs 17225% above
- Part D claims
- 15,841vs 85018.6 times
Medians across 180 geriatric medicine (internal medicine) physicians in Massachusetts with Dmand AI profiles that report each measure.
Dr. Ostrem'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.
Need commercial claims for Dr. Ostrem?
Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Ostrem and other geriatric medicine (internal medicine) physicians in Massachusetts.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Mark Stephan Ostrem treated 215 Medicare patients in 2024, average age 74
CMS counts 215 Medicare patients who saw Dr. Ostrem in 2024. The largest group is 85 and over, with 59 patients. 71% of them have high blood pressure, and 69% have mood disorders. 74% are also on Medicaid. Their average risk score is 2.37, where 1.00 is the Medicare average, so they are sicker than most Medicare patients.
Across all payers, Dmand AI patient panel data puts Dr. Ostrem's median patient age at 74, with 50% women.
Medicare patients, 2024215
Average age74
Average risk score2.37
Also on Medicaid74%
Dr. Ostrem's Medicare patients by age, 2024
Dr. Ostrem's Medicare patients by sex, 2024
- Women11353%
- Men10247%
Chronic conditions among Dr. Ostrem's Medicare patients, 2024
- High blood pressure71%
- Mood disorders69%
- High cholesterol63%
- Depression58%
- Alzheimer's and dementia54%
- Anxiety48%
- Arthritis38%
- Chronic kidney disease32%
Share of Medicare patients with each condition. A patient can have several.
Dr. Ostrem's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 74
Patient panel by sex, all payers
- Women50%
- Men48%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Mark Stephan Ostrem wrote 16,508 Medicare Part D claims in 2024
In 2024, Dr. Ostrem wrote 16,508 Medicare Part D claims for 209 patients. 81% of them were for generic drugs. CMS names the drug for 15,841 of them, across 224 drugs with 11 or more claims each, at $2,106,495 in total drug cost. In 2023, CMS named 15,489 claims across 228 drugs.
Part D claims, 202416,508
Drugs named by CMS224
Total drug cost$2.1M
Part D patients209
Dr. Ostrem's Part D claims by kind of drug, 2024
- Generic13,367 claims81%
- Brand-name3,113 claims19%
- Other28 claims0%
Dr. Ostrem'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. Ostrem's Part D claims, 2024
- Opioids1%203 of 16,508 claims
- Antibiotics2%392 of 16,508 claims
- Antipsychotics, patients 65 and over4%580 of 16,508 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: 15,4892024: 15,8412%
Drugs named by CMS: 224 in 2024, 228 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. Mark Stephan Ostrem takes part in Medicare
Dr. Ostrem 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. Mark Stephan Ostrem has 2 publications on record
Dmand AI links 2 papers to Dr. Ostrem in 2024. 2024 was the busiest year, with 2. The most frequent topics are Magnetic Resonance Imaging and Multiple Sclerosis. Dr. Ostrem's most frequent co-author is Svetlana Primma Eckert, MD.
Papers2
Topics Dr. Ostrem writes about most
- Magnetic Resonance Imaging
- Multiple Sclerosis
Dr. Ostrem's most frequent co-authors
Recent publications by Dr. Ostrem
Mult Scler Relat Disord
BrainDisability EvaluationMagnetic Resonance Imaging
See who Dr. Ostrem researches with
Physician Network Discovery turns co-authorship, shared hospitals and shared groups into a map of who Dr. Ostrem works with, so you can find a warm path to the right geriatric medicine (internal medicine) physicians.
Sources: PubMed (National Library of Medicine); and Dmand AI Research Linkage
Dr. Mark Stephan Ostrem received $533 in industry payments from 2016 to 2025
CMS Open Payments shows 9 general payments to Dr. Ostrem from 5 drug and device companies from 2016 to 2025. Food and beverage make up the largest share, 100% of the total. Neurocrine BioSciences, Inc. paid the most, $301.
General payments to Dr. Ostrem by program year, 2016 to 2025
Companies that paid Dr. Ostrem 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. Mark Stephan Ostrem graduated from University of Minnesota Medical School
Dr. Ostrem graduated from University of Minnesota Medical School in 1976.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. Mark Stephan Ostrem'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 | Dmand AI Affiliation Data |
| Primary practice, affiliations and health system | Dmand AI Affiliation DataDmand AI Org Hierarchy 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) |
| Publications, topics and co-authors | PubMed (National Library of Medicine) (opens in a new tab)Dmand AI Research Linkage |
| 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. Mark Stephan Ostrem
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. Mark Stephan Ostrem's NPI number?
Dr. Mark Stephan Ostrem's NPI number is 1811985633. It was assigned on October 6, 2005, and it is active in the NPI Registry.
What kind of doctor is Dr. Mark Stephan Ostrem?
Dr. Mark Stephan Ostrem is a geriatric medicine (internal medicine) physician in Quincy, Massachusetts. The primary specialty in the NPI Registry is Geriatric Medicine (Internal Medicine) Physician (taxonomy code 207RG0300X).
Where does Dr. Mark Stephan Ostrem practice?
Dr. Ostrem practices at 2 Seaport Drive, Quincy, MA 02171. Dr. Ostrem's primary practice is Alliance Health at Marina Bay in Quincy, Massachusetts. Dmand AI also links Dr. Ostrem to 2 hospitals, 4 group practices and clinics, 3 medical groups, 2 skilled nursing facilities and 1 hospice.
What is Dr. Mark Stephan Ostrem's office phone number?
The practice phone on file for Dr. Ostrem is (617) 769-5106.
What is Dr. Mark Stephan Ostrem's medical license number?
Dr. Ostrem holds Massachusetts license 44501.
Which hospitals is Dr. Mark Stephan Ostrem affiliated with?
Dr. Ostrem is affiliated with Brigham and Women's Faulkner Hospital. Dmand AI links Dr. Ostrem to 2 more hospitals.
What medical group is Dr. Mark Stephan Ostrem part of?
Dr. Ostrem is linked to Steward Medical Group. Dmand AI links Dr. Ostrem to 3 more medical groups.
Does Dr. Mark Stephan Ostrem accept Medicare?
Yes. CMS data shows Dr. Ostrem billed Medicare for 2,002 services in 2024, and Dr. Ostrem accepts Medicare assignment.
How many Medicare patients does Dr. Mark Stephan Ostrem see?
CMS counts 215 Medicare patients who saw Dr. Ostrem in 2024, with an average age of 74.
What services does Dr. Mark Stephan Ostrem bill to Medicare?
In 2024, Dr. Ostrem's most billed Medicare services were nursing facility care (99309), nursing facility care (99308) and nursing facility care (99306).
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Where did Dr. Mark Stephan Ostrem go to medical school?
Dr. Ostrem graduated from University of Minnesota Medical School in 1976.
What drugs does Dr. Mark Stephan Ostrem prescribe most?
In 2024 Medicare Part D data, Dr. Ostrem's most prescribed drugs by claims were Trazodone HCl, Atorvastatin Calcium and Eliquis.
Has Dr. Mark Stephan Ostrem received payments from drug or device companies?
CMS Open Payments shows $533 in general payments to Dr. Ostrem from 5 companies from 2016 to 2025. The largest total came from Neurocrine BioSciences, Inc.
How long has Dr. Mark Stephan Ostrem been practicing?
Dr. Ostrem graduated from medical school in 1976, 50 years ago.
Does Dr. Mark Stephan Ostrem do research?
Dmand AI links 2 publications to Dr. Ostrem.
Who does Dr. Mark Stephan Ostrem publish with?
Dr. Ostrem's most frequent co-authors are Svetlana Primma Eckert, MD (2 shared papers).
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