William D. Loretan, DO
Internal Medicine Physician · Ephrata, PA
William D. Loretan, DO is an internal medicine physician with a practice address in Ephrata, Pennsylvania, and NPI 1245244565, issued on Jul 29, 2006. Check the license (Pennsylvania OS007344E, as entered in NPPES) on the Pennsylvania Department of State (PALS); the Medicare figures below come from public CMS files.
- Name
- William D. Loretan
- Credential
- DO
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- OS007344E PA
Self-reported in NPPES; status is on the state search - Practice location
- 446 N Reading RD, Ephrata, PA 17522
- Phone
- (717) 733-6546
- Enumerated
- Jul 29, 2006
- Record last updated
- Apr 22, 2022
- Fax
- (717) 733-6011
- Medicaid ID
- 1304118 PA
- Medicare enrollment
- Enrolled (PECOS I20050808000659); accepts Medicare assignment
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 7,300 in Pennsylvania → Look up another NPI →
Also registered at 446 N Reading RD
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Arun Agrawal, MDPulmonary Disease Physician1932300241
- Ammar Alimam, MDCritical Care Medicine (Internal Medicine) Physician1770542946
- Lauren Arrick, CRNPFamily Nurse Practitioner1578222071
- Ericka Berger, MDFamily Medicine Physician1942251871
- Carol Blake, PA-CPhysician Assistant1538208533
- Gregory Brown, M.D.Pulmonary Disease Physician1881856334
Verify William D. Loretan in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersPennsylvania Department of State (PALS)
Search for license OS007344ECheck the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
8.2 times the Medicare Part D claims of the average internal medicine physician in 2024
25,904 Medicare Part D claims for 1,223 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 12% of claims. 336 claims were for opioids.
Most prescribed
- Amlodipine Besylate1,063 claims
- Levothyroxine Sodium1,053 claims
- Atorvastatin Calcium1,049 claims
- Furosemide751 claims
- Losartan Potassium686 claims
- Lisinopril678 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.
Bills Medicare through one group practice
- Wellspan Medical GroupNew Holland, PA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
William D. Loretan among 7,300 internal medicine physician records in Pennsylvania
William D. Loretan, DO 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 2006, is newer than 9% of them.
- NPI issued2006 · 9% of these records are older, 64% newer
- In a Medicare fileYes · 78% of these records are
- In the CMS Doctors and Clinicians fileYes · 58% of these records are
- Graduated1989 · median 2008 among the 4,208 with a school on file
- Record last updated2022 · 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).
13 internal medicine physician records list a practice address in Ephrata
They are 13 of the 574 NPPES records with a practice address in Ephrata, and 7,300 internal medicine physician records in Pennsylvania.
All 7,300 in Pennsylvania → Every provider in Ephrata → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Il Chon, M.D.Ephrata, PA 175221538173869
- Shaimaa El Shaarawy, MD, PHD, MSEphrata, PA 175221215533187
- Beth Esterbrook, M.D.Ephrata, PA 175221437160736
- Traci Kohl, MDEphrata, PA 175221841206919
- Abdul Majeed, MDEphrata, PA 175221720392012
- Marino Mallozzi, MDEphrata, PA 175221558377648
- Susanna Margaryan, MDEphrata, PA 175221225221930
- Richard Mellinger, M.D.Ephrata, PA 175221689680738
Common questions
What is William D. Loretan, DO's NPI number?
William D. Loretan, DO's National Provider Identifier (NPI) is 1245244565, issued on Jul 29, 2006. An NPI identifies a provider in billing; it is not a license.
Where is William D. Loretan, DO located?
The NPPES record lists a practice address at 446 N Reading RD, Ephrata, PA, 17522. Phone: (717) 733-6546. Providers update this record themselves, so call before visiting.
How can I verify William D. Loretan, DO's license?
NPPES lists Pennsylvania license number OS007344E, 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 William D. Loretan, DO prescribe under Medicare Part D?
In 2024, William D. Loretan, DO had 25,904 Medicare Part D claims for 1,223 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.