Marissa Lara Ambron, D.O.
Internal Medicine Physician · Williamsport, PA
Marissa Lara Ambron, D.O. is an internal medicine physician with a practice address in Williamsport, Pennsylvania, and NPI 1518113570, issued on Aug 11, 2008. Check the license (Pennsylvania OS014928, as entered in NPPES) on the Pennsylvania Department of State (PALS); the Medicare figures below come from public CMS files.
- Name
- Marissa Lara Ambron
- Credential
- D.O.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License numbers
- OS014928 PA
0012720 PA
Self-reported in NPPES; status is on the state search - Practice location
- 700 High Street, Williamsport, PA 17701
- Phone
- (570) 321-2850
- Enumerated
- Aug 11, 2008
- Record last updated
- Jan 11, 2012 (not updated in 14 years: call before relying on the address or phone)
- Fax
- (570) 321-2851
- Medicare enrollment
- Enrolled (PECOS I20110714000328); accepts Medicare assignment
- Medical or professional school
- Philadelphia College Of Osteopathic Medicine, 2008
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 7,300 in Pennsylvania → Look up another NPI →
Also registered at 700 High Street
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Jed Nieves, CRNPNurse Practitioner1336615897
- Dana Poleto, CRNPGerontology Nurse Practitioner1467163345
- Daniel Shin, DOInternal Medicine Physician1851755086
- Timothy Wirth, PHARMDPharmacist1013351378
Verify Marissa Lara Ambron in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersPennsylvania Department of State (PALS)
Search for license OS014928Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
93% fewer Medicare Part D claims than the average internal medicine physician in 2024
234 Medicare Part D claims for 104 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. 11 claims were for opioids.
Most prescribed
- Pantoprazole Sodium15 claims
- Furosemide14 claims
- Cephalexin12 claims
- Atorvastatin Calcium11 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.
The MIPS final score for 2023 (Medicare payment program): 95.6 of 100
The Merit-based Incentive Payment System score is reported for this clinician. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023; category weights for 2023 (qpp.cms.gov).
Industry payments in 2024: $113.40
1 payment: food and beverage; the largest payer was Boehringer Ingelheim Pharmaceuticals, 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
- St Lukes Physician Group IncQuakertown, PA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Marissa Lara Ambron among 7,300 internal medicine physician records in Pennsylvania
Marissa Lara Ambron, D.O. is one of 7,300 internal medicine physician records with a practice address in Pennsylvania. 78% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2008, is newer than 43% of them.
- NPI issued2008 · 43% of these records are older, 53% newer
- In a Medicare fileYes · 78% of these records are
- In the CMS Doctors and Clinicians fileYes · 58% of these records are
- Graduated2008 · median 2008 among the 4,208 with a school on file
- Record last updated2012 · 56% 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 Pennsylvania practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
31 internal medicine physician records list a practice address in Williamsport
They are 31 of the 1,371 NPPES records with a practice address in Williamsport, and 7,300 internal medicine physician records in Pennsylvania.
All 7,300 in Pennsylvania → Every provider in Williamsport → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Thomas Cullen, D.O.Williamsport, PA 177011730156043
- David Finn, MDWilliamsport, PA 177011194786004
- Daniel GlunkWilliamsport, PA 177011881654010
- Russell Gombosi, MDWilliamsport, PA 177011528078433
- Puneet Gupta, M.D.Williamsport, PA 177011497962286
- Barbara Heere, MDWilliamsport, PA 177011902865793
- Renuka KakaralaWilliamsport, PA 177011417012030
- Joanne Lalli, MDWilliamsport, PA 177011942293287
Common questions
What is Marissa Lara Ambron, D.O.'s NPI number?
Marissa Lara Ambron, D.O.'s National Provider Identifier (NPI) is 1518113570, issued on Aug 11, 2008. An NPI identifies a provider in billing; it is not a license.
Where is Marissa Lara Ambron, D.O. located?
The NPPES record lists a practice address at 700 High Street, Williamsport, PA, 17701. Phone: (570) 321-2850. Providers update this record themselves, so call before visiting.
How can I verify Marissa Lara Ambron, D.O.'s license?
NPPES lists Pennsylvania license number OS014928, as entered by the provider. Search the Pennsylvania Department of State (PALS) at https://www.pals.pa.gov/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Marissa Lara Ambron, D.O. prescribe under Medicare Part D?
In 2024, Marissa Lara Ambron, D.O. had 234 Medicare Part D claims for 104 beneficiaries; the average among internal medicine physician prescribers was 3,176. Part D covers Medicare prescriptions only.
What is Marissa Lara Ambron, D.O.'s MIPS final score?
The 2023 MIPS final score is 95.6 of 100. The average among 454,083 clinicians with a measured score was 83.5.
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.