Kelly J. Ocallahan, M.D.
Gastroenterology Physician · Worcester, MA
Kelly J. Ocallahan, M.D. is a gastroenterology physician with a practice address in Worcester, Massachusetts, and NPI 1427056795, issued on Jul 12, 2005. Check the license (Massachusetts 159560, as entered in NPPES) on the Massachusetts Board of Registration in Medicine; the Medicare figures below come from public CMS files.
- Name
- Kelly J. Ocallahan
- Credential
- M.D.
- Primary taxonomy
- Gastroenterology Physician 207RG0100X
- License number
- 159560 MA
Self-reported in NPPES; status is on the state search - Practice location
- 100 Central St, Worcester, MA 01608
- Phone
- (508) 831-0708
- Enumerated
- Jul 12, 2005
- Record last updated
- Jul 13, 2026
- Fax
- (508) 831-0272
- Medicaid ID
- 3201601 MA
- Medicare enrollment
- Enrolled (PECOS I20040511000166); accepts Medicare assignment
- Medical or professional school
- University Of Massachusetts Medical School, 1993
- Entity
- Type 1 · individual
8 nearest gastroenterology physician records → All 686 in Massachusetts → Look up another NPI →
Also registered at 100 Central St
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Kyung Kim, M.D.Gastroenterology Physician1619974656
Verify Kelly J. Ocallahan in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMassachusetts Board of Registration in Medicine
Search for license 159560Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
2.3 times the Medicare Part D claims of the average gastroenterology physician in 2024
1,845 Medicare Part D claims for 632 beneficiaries, against an average of 811 among the 16,445 providers of this specialty who prescribed in Part D. Brand-name drugs were 18% of claims.
Most prescribed
- Famotidine298 claims
- Pantoprazole Sodium264 claims
- Omeprazole225 claims
- Gavilyte-G171 claims
- Linzess120 claims
- Sucralfate119 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: $1,583.31
73 payments; by number, the most common kind was food and beverage; the largest payer was Abbvie Inc. The 13,350 providers of this specialty with any payment received $5,015.95 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
- New England Gastroenterology Associates, PCWorcester, MA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Kelly J. Ocallahan among 686 gastroenterology physician records in Massachusetts
Kelly J. Ocallahan, M.D. is one of 686 gastroenterology physician records with a practice address in Massachusetts. 80% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2005, is newer than 0% of them.
- NPI issued2005 · 0% of these records are older, 86% newer
- In a Medicare fileYes · 80% of these records are
- In the CMS Doctors and Clinicians fileYes · 72% of these records are
- Graduated1993 · median 2004 among the 491 with a school on file
- Record last updated2026 · 66% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RG0100X and a Massachusetts practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Gastroenterology Physician providers in Massachusetts
There are 686 gastroenterology physician records in Massachusetts.
All 686 in Massachusetts → Every provider in Worcester → Gastroenterology Physician nationwide →
The 8 gastroenterology physician records with the nearest ZIP codes
- Curuchi Anand, M.D., MRCP (V.K)Worcester, MA 016081336111731
- Elise Jacques, MDWorcester, MA 016081619965977
- Kyung Kim, M.D.Worcester, MA 016081619974656
- Akwi Asombang, M.DWorcester, MA 016051679778765
- Michael Choi, MDWorcester, MA 016051922083344
- Harry Elvanides, MDWorcester, MA 016051164526869
- Neil Patel, MDWorcester, MA 016051184113300
- Prashanth Rau, M.D.Worcester, MA 016051336501311
Common questions
What is Kelly J. Ocallahan, M.D.'s NPI number?
Kelly J. Ocallahan, M.D.'s National Provider Identifier (NPI) is 1427056795, issued on Jul 12, 2005. An NPI identifies a provider in billing; it is not a license.
Where is Kelly J. Ocallahan, M.D. located?
The NPPES record lists a practice address at 100 Central St, Worcester, MA, 01608. Phone: (508) 831-0708. Providers update this record themselves, so call before visiting.
How can I verify Kelly J. Ocallahan, M.D.'s license?
NPPES lists Massachusetts license number 159560, as entered by the provider. Search the Massachusetts Board of Registration in Medicine at https://findmydoctor.mass.gov/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Kelly J. Ocallahan, M.D. prescribe under Medicare Part D?
In 2024, Kelly J. Ocallahan, M.D. had 1,845 Medicare Part D claims for 632 beneficiaries; the average among gastroenterology physician prescribers was 811. 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.