Mark Leo Timmerman, M.D.
Family Medicine Physician · Merrimack, NH
Mark Leo Timmerman, M.D. is a family medicine physician with a practice address in Merrimack, New Hampshire, and NPI 1972525574, issued on Jul 24, 2006. Check the license (New Hampshire NH 7663, as entered in NPPES) on the New Hampshire Board of Medicine; the Medicare figures below come from public CMS files.
- Name
- Mark Leo Timmerman
- Credential
- M.D.
- Primary taxonomy
- Family Medicine Physician 207Q00000X
- License number
- NH 7663 NH
Self-reported in NPPES; status is on the state search - Practice location
- 454 Daniel Webster Hwy, Merrimack, NH 03054
- Phone
- (603) 424-8120
- Enumerated
- Jul 24, 2006
- Record last updated
- Mar 7, 2023
- Fax
- (603) 424-8140
- Medicare enrollment
- Enrolled (PECOS I20050506000067); accepts Medicare assignment
- Medical or professional school
- University Of Iowa, Rj & L Carver College Of Medicine, 1984
- Entity
- Type 1 · individual
8 nearest family medicine physician records → All 816 in New Hampshire → Look up another NPI →
Also registered at 454 Daniel Webster Hwy
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Carol Landon, ARNPFamily Nurse Practitioner1639103229
Verify Mark Leo Timmerman in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersNew Hampshire Board of Medicine
Search for license NH 7663Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
89% fewer Medicare Part D claims than the average family medicine physician in 2024
399 Medicare Part D claims for 63 beneficiaries, against an average of 3,544 among the 117,163 providers of this specialty who prescribed in Part D. Brand-name drugs were 15% of claims.
Most prescribed
- Rosuvastatin Calcium39 claims
- Levothyroxine Sodium34 claims
- Nebivolol Hcl24 claims
- Omeprazole16 claims
- Tamsulosin Hcl16 claims
- Jardiance13 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: $77.03
3 payments; by number, the most common kind was food and beverage; the largest payer was AstraZeneca Pharmaceuticals LP. The 55,478 providers of this specialty with any payment received $902.55 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.
Mark Leo Timmerman among 816 family medicine physician records in New Hampshire
Mark Leo Timmerman, M.D. is one of 816 family medicine physician records with a practice address in New Hampshire. 74% 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 13% of them.
- NPI issued2006 · 13% of these records are older, 43% newer
- In a Medicare fileYes · 74% of these records are
- In the CMS Doctors and Clinicians fileYes · 61% of these records are
- Graduated1984 · median 2003 among the 498 with a school on file
- Record last updated2023 · 62% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207Q00000X and a New Hampshire practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
16 family medicine physician records list a practice address in Merrimack
They are 16 of the 270 NPPES records with a practice address in Merrimack, and 816 family medicine physician records in New Hampshire.
All 816 in New Hampshire → Every provider in Merrimack → Family Medicine Physician nationwide →
The 8 family medicine physician records with the nearest ZIP codes
- Thomas Astolfi, M.DMerrimack, NH 030541689650665
- William Blackwood, M.D.Merrimack, NH 030541346226107
- Archie Dickinson, MDMerrimack, NH 030541518143650
- Holly Drexler, M.D.Merrimack, NH 030541790761542
- Debra Garlin, DOMerrimack, NH 030541679537690
- Edward Hall, M.D.Merrimack, NH 030541083622674
- Ewa Jankowska, MDMerrimack, NH 030541659682961
- Nicola Kernan, M.D.Merrimack, NH 030541093791832
Common questions
What is Mark Leo Timmerman, M.D.'s NPI number?
Mark Leo Timmerman, M.D.'s National Provider Identifier (NPI) is 1972525574, issued on Jul 24, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Mark Leo Timmerman, M.D. located?
The NPPES record lists a practice address at 454 Daniel Webster Hwy, Merrimack, NH, 03054. Phone: (603) 424-8120. Providers update this record themselves, so call before visiting.
How can I verify Mark Leo Timmerman, M.D.'s license?
NPPES lists New Hampshire license number NH 7663, as entered by the provider. Search the New Hampshire Board of Medicine at https://www.oplc.nh.gov/board-medicine. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Mark Leo Timmerman, M.D. prescribe under Medicare Part D?
In 2024, Mark Leo Timmerman, M.D. had 399 Medicare Part D claims for 63 beneficiaries; the average among family medicine physician prescribers was 3,544. 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.