Mark Oldendorf, MD
Internal Medicine Physician · Loudonville, NY
Mark Oldendorf, MD is an internal medicine physician with a practice address in Loudonville, New York, and NPI 1427147800, issued on Oct 12, 2006. Check the license (New York 146168, as entered in NPPES) on the NYS Education Department, Office of the Professions; the Medicare figures below come from public CMS files.
- Name
- Mark Oldendorf
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 146168 NY
Self-reported in NPPES; status is on the state search - Practice location
- 407 Albany Shaker RD Ste 100, Loudonville, NY 12211
- Phone
- (518) 435-1300
- Enumerated
- Oct 12, 2006
- Record last updated
- Feb 7, 2019 (not updated in 7 years: call before relying on the address or phone)
- Medicaid ID
- 00654260 NY
- Medicare enrollment
- Enrolled (PECOS I20050712000284); accepts Medicare assignment
- Medical or professional school
- Albany Medical College Of Union University, 1976
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 12,067 in New York → Look up another NPI →
Also registered at 407 Albany Shaker RD Ste 100
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Claudianus Bourne, FNPFamily Nurse Practitioner1851646541
- Michelle Cafaro, RPA-CMedical Physician Assistant1619205655
- Hwal Lee, PAPhysician Assistant1255803359
- Hedy Migden, M.D.Internal Medicine Physician1568422483
Verify Mark Oldendorf in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersNYS Education Department, Office of the Professions
Search for license 146168Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
2.1 times the Medicare Part D claims of the average internal medicine physician in 2024
6,657 Medicare Part D claims for 1,065 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 10% of claims. 598 claims were for opioids.
Most prescribed
- Omeprazole271 claims
- Hydrocodone-Acetaminophen262 claims
- Alprazolam243 claims
- Atorvastatin Calcium224 claims
- Amlodipine Besylate190 claims
- Levothyroxine Sodium186 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Industry payments in 2024: $1,057.18
62 payments; by number, the most common kind was food and beverage; the largest payer was Abbvie Inc. The 50,334 providers of this specialty with any payment received $1,303.06 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through one group practice
- Oldendorf Medical Services PLLCLoudonville, NY
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Mark Oldendorf among 12,067 internal medicine physician records in New York
Mark Oldendorf, MD is one of 12,067 internal medicine physician records with a practice address in New York. 79% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 8% of them.
- NPI issued2006 · 8% of these records are older, 53% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileYes · 60% of these records are
- Graduated1976 · median 2002 among the 7,221 with a school on file
- Record last updated2019 · 61% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a New York practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
3 internal medicine physician records list a practice address in Loudonville
They are 3 of the 84 NPPES records with a practice address in Loudonville, and 12,067 internal medicine physician records in New York.
All 12,067 in New York → Every provider in Loudonville → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Ashok Baghel, MDLoudonville, NY 122111639105109
- Luiz Coelho, MDAlbany, NY 122111164564514
- Hala Elfaki, MDAlbany, NY 122111659931848
- Ravi Jayanti, MDAlbany, NY 122111457598088
- Barbara Kapuscinska, MDAlbany, NY 122111902803414
- Ann Michalek, MDAlbany, NY 122111336146844
- Hedy Migden, M.D.Loudonville, NY 122111568422483
- Vanessa Pike Denning, MDAlbany, NY 122111447257936
Common questions
What is Mark Oldendorf, MD's NPI number?
Mark Oldendorf, MD's National Provider Identifier (NPI) is 1427147800, issued on Oct 12, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Mark Oldendorf, MD located?
The NPPES record lists a practice address at 407 Albany Shaker RD Ste 100, Loudonville, NY, 12211. Phone: (518) 435-1300. Providers update this record themselves, so call before visiting.
How can I verify Mark Oldendorf, MD's license?
NPPES lists New York license number 146168, as entered by the provider. Search the NYS Education Department, Office of the Professions at https://www.op.nysed.gov/services/verifications/online-verification-searches. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Mark Oldendorf, MD prescribe under Medicare Part D?
In 2024, Mark Oldendorf, MD had 6,657 Medicare Part D claims for 1,065 beneficiaries; the average among internal medicine physician prescribers was 3,176. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.