Dr. Mark W. Oldendorf, MD
- Medicare services, 2024
- 1,783
- Medicare patients, 2024
- 377
- Part D claims, 2024
- 6,657
- Hospital affiliations
- 5
- Industry payments
- $6,230
- Practice address
- 407 Albany Shaker Rd Suite 100 Suite 100, Loudonville, NY 12211-1962
- Practice phone
- Call (518) 435-1300
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Oldendorf Medical Services
Primary care practice · Loudonville, New York
Find Dr. Oldendorf'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 W. Oldendorf is an internist in Loudonville, New York
Dr. Oldendorf practices at Oldendorf Medical Services in Loudonville, New York.
Dr. Oldendorf's NPI, 1427147800, was assigned on October 12, 2006. Dr. Oldendorf graduated from Albany Medical College in 1976. Dr. Oldendorf holds New York license 146168.
- NPI
- 1427147800NPI Registry (opens in a new tab)
- Medicare PAC ID
- 7113953142
- NPI enumeration date
- October 12, 2006
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
- Practice phone
- (518) 435-1300
- 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 W. Oldendorf practices at Oldendorf Medical Services in Loudonville, New York
Dr. Oldendorf's primary practice is Oldendorf Medical Services, at 407 Albany Shaker Rd Suite 100 Suite 100, Loudonville, NY 12211-1962. The practice phone is (518) 435-1300.
- Oldendorf Medical Services407 Albany Shaker Rd Suite 100 Suite 100, Loudonville, NY 12211-1962Phone(518) 435-1300
Source: Dmand AI Affiliation Data
Dr. Mark W. Oldendorf is affiliated with 11 sites of care and 3 medical groups
Dr. Oldendorf's primary practice is Oldendorf Medical Services in Loudonville, New York. Dr. Oldendorf is also affiliated with Albany Medical Center. The medical group on file is Oldendorf Medical Services. Dmand AI also links Dr. Oldendorf to 4 more hospitals, 2 group practices and clinics, 2 home health agencies, 2 medical groups and 1 hospice, each named with a free account.
Source: Dmand AI Affiliation Data
Dmand AI tracks the EHR system at Dr. Mark W. Oldendorf's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Oldendorf practices, 11 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Oldendorf Medical Services | Available with a free account |
| +10 more sites and 2 medical groups | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Mark W. Oldendorf is one of 9,643 internists in New York
Internal medicine is Dr. Oldendorf's primary specialty in the NPI Registry, under taxonomy code 207R00000X. Dr. Oldendorf is licensed in New York.
Specialties and state licenses
- Internal medicine, New YorkPrimary
Internists near Dr. Oldendorf
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. Mark W. Oldendorf billed Medicare for 1,783 services in 2024
CMS data shows 1,783 Medicare services from Dr. Oldendorf across 17 procedure codes in 2024, for 377 Medicare patients. Medicare paid $80,239 for them. Every service was in an office.
Dr. Oldendorf's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Other services
- 2023: 6462024: 1,07566%
- Office and hospital visits
- 2023: 7802024: 52433%
- Lab and pathology
- 2023: 1302024: 1397%
- Tests and treatments
- 2023: 862024: 4548%
Dr. Oldendorf compared with the New York median for internists, 2024
- Dr. Oldendorf
- New York median
- Medicare services
- 1,783vs 4264.2 times
- Medicare patients
- 377vs 1582.4 times
- Part D claims
- 5,840vs 6229.4 times
Medians across 9,428 internists in New York with Dmand AI profiles that report each measure.
Dr. Oldendorf'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. Oldendorf and other internists in New York.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Mark W. Oldendorf treated 377 Medicare patients in 2024, average age 75
CMS counts 377 Medicare patients who saw Dr. Oldendorf in 2024. The largest group is 65 to 74, with 156 patients. 75% of them have high cholesterol, and 71% have high blood pressure. 6% are also on Medicaid. Their average risk score is 1.24, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Dr. Oldendorf's median patient age at 65, with 47% women.
Dr. Oldendorf's Medicare patients by age, 2024
Dr. Oldendorf's Medicare patients by sex, 2024
- Women14639%
- Men23161%
Chronic conditions among Dr. Oldendorf's Medicare patients, 2024
- High cholesterol75%
- High blood pressure71%
- Ischemic heart disease43%
- Arthritis36%
- Diabetes24%
- Anxiety21%
- Chronic kidney disease21%
- Cancer19%
Share of Medicare patients with each condition. A patient can have several.
Dr. Oldendorf's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 65
Patient panel by sex, all payers
- Women47%
- Men53%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Mark W. Oldendorf wrote 6,657 Medicare Part D claims in 2024
In 2024, Dr. Oldendorf wrote 6,657 Medicare Part D claims for 1,065 patients. 90% of them were for generic drugs. CMS names the drug for 5,840 of them, across 112 drugs with 11 or more claims each, at $365,067 in total drug cost. In 2023, CMS named 5,414 claims across 115 drugs.
Dr. Oldendorf's Part D claims by kind of drug, 2024
- Generic5,966 claims90%
- Brand-name667 claims10%
- Other24 claims0%
Dr. Oldendorf'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. Oldendorf's Part D claims, 2024
- Opioids9%598 of 6,657 claims
- Antibiotics2%104 of 6,657 claims
- Antipsychotics, patients 65 and over0%23 of 6,657 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: 5,4142024: 5,8408%
Drugs named by CMS: 112 in 2024, 115 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. Mark W. Oldendorf offers telehealth to Medicare patients
Dr. Oldendorf accepts Medicare assignment, so Medicare's approved amount is taken as full payment. CMS lists Dr. Oldendorf as offering telehealth.
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
Source: Doctors and Clinicians National Downloadable File (CMS)
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Dr. Mark W. Oldendorf received $6,230 in industry payments from 2016 to 2025
CMS Open Payments shows 346 general payments to Dr. Oldendorf from 46 drug and device companies from 2016 to 2025. Food and beverage make up the largest share, 99% of the total. Novo Nordisk Inc paid the most, $825.
General payments to Dr. Oldendorf by program year, 2016 to 2025
General payments to Dr. Oldendorf by kind, 2016 to 2025
- Food and beverage$6,18199%
- Education$491%
Companies that paid Dr. Oldendorf 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 W. Oldendorf graduated from Albany Medical College
Dr. Oldendorf graduated from Albany Medical College in 1976.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. Mark W. Oldendorf'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 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. Mark W. Oldendorf
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 W. Oldendorf's NPI number?
Dr. Mark W. Oldendorf's NPI number is 1427147800. It was assigned on October 12, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. Mark W. Oldendorf?
Dr. Mark W. Oldendorf is an internist in Loudonville, New York. The primary specialty in the NPI Registry is Internal Medicine Physician (taxonomy code 207R00000X).
Where does Dr. Mark W. Oldendorf practice?
Dr. Oldendorf practices at 407 Albany Shaker Rd Suite 100 Suite 100, Loudonville, NY 12211-1962. Dr. Oldendorf's primary practice is Oldendorf Medical Services in Loudonville, New York. Dmand AI also links Dr. Oldendorf to 4 hospitals, 2 group practices and clinics, 2 home health agencies, 2 medical groups and 1 hospice.
What is Dr. Mark W. Oldendorf's office phone number?
The practice phone on file for Dr. Oldendorf is (518) 435-1300.
What is Dr. Mark W. Oldendorf's medical license number?
Dr. Oldendorf holds New York license 146168.
Which hospitals is Dr. Mark W. Oldendorf affiliated with?
Dr. Oldendorf is affiliated with Albany Medical Center. Dmand AI links Dr. Oldendorf to 4 more hospitals.
What medical group is Dr. Mark W. Oldendorf part of?
Dr. Oldendorf is linked to Oldendorf Medical Services. Dmand AI links Dr. Oldendorf to 2 more medical groups.
Does Dr. Mark W. Oldendorf accept Medicare?
Yes. CMS data shows Dr. Oldendorf billed Medicare for 1,783 services in 2024, and Dr. Oldendorf accepts Medicare assignment.
Does Dr. Mark W. Oldendorf offer telehealth?
Yes. The CMS Doctors and Clinicians file lists Dr. Oldendorf as offering telehealth services.
How many Medicare patients does Dr. Mark W. Oldendorf see?
CMS counts 377 Medicare patients who saw Dr. Oldendorf in 2024, with an average age of 75.
Show 5 more questionsShow fewer questions
What services does Dr. Mark W. Oldendorf bill to Medicare?
In 2024, Dr. Oldendorf's most billed Medicare services were medicare service (G2211), medicare service (G0444) and office visit, established patient (99213).
Where did Dr. Mark W. Oldendorf go to medical school?
Dr. Oldendorf graduated from Albany Medical College in 1976.
What drugs does Dr. Mark W. Oldendorf prescribe most?
In 2024 Medicare Part D data, Dr. Oldendorf's most prescribed drugs by claims were Omeprazole, Hydrocodone-Acetaminophen and Alprazolam.
Has Dr. Mark W. Oldendorf received payments from drug or device companies?
CMS Open Payments shows $6,230 in general payments to Dr. Oldendorf from 46 companies from 2016 to 2025. The largest total came from Novo Nordisk Inc.
How long has Dr. Mark W. Oldendorf been practicing?
Dr. Oldendorf graduated from medical school in 1976, 50 years ago.
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