Louis Mariano Santiago, MD
Internal Medicine Physician · Easton, PA
Louis Mariano Santiago, MD is an internal medicine physician with a practice address in Easton, Pennsylvania, and NPI 1225777568, issued on Jun 3, 2022. Check the license (Pennsylvania MT226865, as entered in NPPES) on the Pennsylvania Department of State (PALS); the Medicare figures below come from public CMS files.
- Name
- Louis Mariano Santiago
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License numbers
- MT226865 PA
25MA12764900 NJ
Self-reported in NPPES; status is on the state search - Practice location
- 400 S Greenwood Ave, Easton, PA 18045
- Phone
- (484) 503-3073
- Enumerated
- Jun 3, 2022
- Record last updated
- May 1, 2026
- Medicare enrollment
- Enrolled (PECOS I20260522000387); may accept Medicare assignment
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 7,300 in Pennsylvania → Look up another NPI →
Also registered at 400 S Greenwood Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Louis Mariano Santiago in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersPennsylvania Department of State (PALS)
Search for license MT226865Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
94% fewer Medicare Part D claims than the average internal medicine physician in 2024
185 Medicare Part D claims for 59 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D.
Most prescribed
- Metoprolol Succinate12 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: $224.34
2 payments; by number, the most common kind was food and beverage; the largest payer was Amgen 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.
Louis Mariano Santiago among 7,300 internal medicine physician records in Pennsylvania
Louis Mariano Santiago, MD 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 2022, is newer than 85% of them.
- NPI issued2022 · 85% of these records are older, 11% newer
- In a Medicare fileYes · 78% of these records are
- In the CMS Doctors and Clinicians fileYes · 58% of these records are
- Graduated2022 · median 2008 among the 4,208 with a school on file
- Record last updated2026 · 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).
104 internal medicine physician records list a practice address in Easton
They are 104 of the 1,535 NPPES records with a practice address in Easton, and 7,300 internal medicine physician records in Pennsylvania.
All 7,300 in Pennsylvania → Every provider in Easton → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Anthony Amoroso, M.D.Easton, PA 180451144222555
- Mark Auerbach, MDEaston, PA 180451811999220
- Suzette Barreto, MDEaston, PA 180451285617217
- Maria Figueras, MDEaston, PA 180451942408190
- Pramila Gupta, M.D.Easton, PA 180451023010469
- Harvey Hakim, M.D.Easton, PA 180451740282169
- Mark Koshar, M.D.Easton, PA 180451538161963
- Vikin Lalan, M.D.Easton, PA 180451750693834
Common questions
What is Louis Mariano Santiago, MD's NPI number?
Louis Mariano Santiago, MD's National Provider Identifier (NPI) is 1225777568, issued on Jun 3, 2022. An NPI identifies a provider in billing; it is not a license.
Where is Louis Mariano Santiago, MD located?
The NPPES record lists a practice address at 400 S Greenwood Ave, Easton, PA, 18045. Phone: (484) 503-3073. Providers update this record themselves, so call before visiting.
How can I verify Louis Mariano Santiago, MD's license?
NPPES lists Pennsylvania license number MT226865, 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 Louis Mariano Santiago, MD prescribe under Medicare Part D?
In 2024, Louis Mariano Santiago, MD had 185 Medicare Part D claims for 59 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.