Robert John Larkin, MD
Internal Medicine Physician · Manchester, NH
Robert John Larkin, MD is an internal medicine physician with a practice address in Manchester, New Hampshire, and NPI 1457397713, issued on Jun 22, 2006. Check the license (New Hampshire 11001, as entered in NPPES) on the New Hampshire Board of Medicine; the Medicare figures below come from public CMS files.
- Name
- Robert John Larkin
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 11001 NH
Self-reported in NPPES; status is on the state search - Practice location
- 57 Webster St, Manchester, NH 03104
- Phone
- (603) 668-6489
- Enumerated
- Jun 22, 2006
- Record last updated
- Mar 12, 2021 (not updated in 5 years: call before relying on the address or phone)
- Fax
- (603) 633-7884
- Medicaid ID
- RE5843 NH
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 673 in New Hampshire → Look up another NPI →
Also registered at 57 Webster St
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Belinda Castor, M.D.Internal Medicine Physician1679517031
- Brian Claussen, M.D.Family Medicine Physician1952394538
- Christine Cochrane, D.O.Internal Medicine Physician1245215631
- Paige Fowler, RNRegistered Nurse1043167240
- Scott Hochgraf, MDInternal Medicine Physician1568403350
- Kristyna Lampman, APRNNurse Practitioner1154742179
Verify Robert John Larkin in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersNew Hampshire Board of Medicine
Search for license 11001Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
42% more Medicare Part D claims than the average internal medicine physician in 2024
4,507 Medicare Part D claims for 426 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.
Most prescribed
- Atorvastatin Calcium513 claims
- Amlodipine Besylate287 claims
- Lisinopril218 claims
- Metformin Hcl179 claims
- Pantoprazole Sodium177 claims
- Levothyroxine Sodium175 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.
Robert John Larkin among 673 internal medicine physician records in New Hampshire
Robert John Larkin, MD is one of 673 internal medicine physician records with a practice address in New Hampshire. 81% 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, 50% newer
- In a Medicare fileYes · 81% of these records are
- In the CMS Doctors and Clinicians fileNo · 66% of these records are
- Record last updated2021 · 53% 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 Hampshire practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
95 internal medicine physician records list a practice address in Manchester
They are 95 of the 4,401 NPPES records with a practice address in Manchester, and 673 internal medicine physician records in New Hampshire.
All 673 in New Hampshire → Every provider in Manchester → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Belinda Castor, M.D.Manchester, NH 031041679517031
- Christine Cochrane, D.O.Manchester, NH 031041245215631
- Hetal Dave, MDManchester, NH 031041134198476
- Scott Hochgraf, MDManchester, NH 031041568403350
- Marc Levenson, M.D.Manchester, NH 031041568415891
- Paula Lovinski, M.D.Manchester, NH 031041174564132
- Michael Mayo-Smith, M.D.Manchester, NH 031041912975285
- Omair Mutib, M.DManchester, NH 031041679551550
Common questions
What is Robert John Larkin, MD's NPI number?
Robert John Larkin, MD's National Provider Identifier (NPI) is 1457397713, issued on Jun 22, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Robert John Larkin, MD located?
The NPPES record lists a practice address at 57 Webster St, Manchester, NH, 03104. Phone: (603) 668-6489. Providers update this record themselves, so call before visiting.
How can I verify Robert John Larkin, MD's license?
NPPES lists New Hampshire license number 11001, 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 Robert John Larkin, MD prescribe under Medicare Part D?
In 2024, Robert John Larkin, MD had 4,507 Medicare Part D claims for 426 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.