Barbara J. Maccollum, M.D.
Gastroenterology Physician · Phoenix, AZ
Barbara J. Maccollum, M.D. is a gastroenterology physician with a practice address in Phoenix, Arizona, and NPI 1215925821, issued on Oct 7, 2005. Check the license (Arizona 15579, as entered in NPPES) on the Arizona Medical Board; the Medicare figures below come from public CMS files.
- Name
- Barbara J. Maccollum
- Credential
- M.D.
- Primary taxonomy
- Gastroenterology Physician 207RG0100X
- License number
- 15579 AZ
Self-reported in NPPES; status is on the state search - Practice location
- 1300 N 12TH St, Phoenix, AZ 85006
- Phone
- (602) 254-5321
- Enumerated
- Oct 7, 2005
- Record last updated
- Feb 17, 2017 (not updated in 9 years: call before relying on the address or phone)
- Fax
- (602) 254-6582
- Medicaid ID
- 260240 AZ
- Medicare enrollment
- Enrolled (PECOS I20060104000423); accepts Medicare assignment
- Medical or professional school
- University Of Arizona College Of Medicine, 1984
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest gastroenterology physician records → All 403 in Arizona → Look up another NPI →
Also registered at 1300 N 12TH St
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Jacqueline Agenbroad, NPNurse Practitioner1447222328
- Nishant Anand, M.D.Emergency Medicine Physician1093847659
- Jacob Anderson, D.O.Family Medicine Physician1558708792
- Patricia Armstrong, PAPhysician Assistant1326015165
- Sandra Auvil, MDInternal Medicine Physician1215993464
Verify Barbara J. Maccollum in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersArizona Medical Board
Search for license 15579Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
63% more Medicare Part D claims than the average gastroenterology physician in 2024
1,325 Medicare Part D claims for 374 beneficiaries, against an average of 811 among the 16,445 providers of this specialty who prescribed in Part D.
Most prescribed
- Pantoprazole Sodium284 claims
- Famotidine260 claims
- Ondansetron Odt123 claims
- Omeprazole74 claims
- Colestipol Hcl59 claims
- Linzess53 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.
No measured MIPS final score for 2023
CMS assigned the neutral MIPS final score of 75 without scoring Quality, Cost, Promoting Interoperability or Improvement Activities. It is an administrative threshold, so PlainDoctor does not compare it with measured clinicians.
Source: CMS Quality Payment Program, MIPS performance year 2023, group reporting; category weights for 2023 (qpp.cms.gov).
Industry payments in 2024: $38.65
1 payment: food and beverage; the largest payer was Medtronic, 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
- Arizona Digestive Health PCGlendale, AZ
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Barbara J. Maccollum among 403 gastroenterology physician records in Arizona
Barbara J. Maccollum, M.D. is one of 403 gastroenterology physician records with a practice address in Arizona. 84% 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, 83% newer
- In a Medicare fileYes · 84% of these records are
- In the CMS Doctors and Clinicians fileYes · 73% of these records are
- Graduated1984 · median 2001 among the 295 with a school on file
- Record last updated2017 · 47% 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 Arizona practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Gastroenterology Physician providers in Arizona
There are 403 gastroenterology physician records in Arizona.
All 403 in Arizona → Every provider in Phoenix → Gastroenterology Physician nationwide →
The 8 gastroenterology physician records with the nearest ZIP codes
- Aws Alameri, MDPhoenix, AZ 850061114423381
- Lynna Alnimer, M.D.Phoenix, AZ 850061215490461
- Paul Berggreen, M.D.Phoenix, AZ 850061093703605
- Tyler Cobbs, DOPhoenix, AZ 850061588123350
- Joseph David, M.D.Phoenix, AZ 850061700874310
- Brenda Dennert, M.D.Phoenix, AZ 850061235127846
- Ma Ai Thanda Han, M.DPhoenix, AZ 850061114202579
- Rawad Mounzer, M.D.Phoenix, AZ 850061154554236
Common questions
What is Barbara J. Maccollum, M.D.'s NPI number?
Barbara J. Maccollum, M.D.'s National Provider Identifier (NPI) is 1215925821, issued on Oct 7, 2005. An NPI identifies a provider in billing; it is not a license.
Where is Barbara J. Maccollum, M.D. located?
The NPPES record lists a practice address at 1300 N 12TH St, Phoenix, AZ, 85006. Phone: (602) 254-5321. Providers update this record themselves, so call before visiting.
How can I verify Barbara J. Maccollum, M.D.'s license?
NPPES lists Arizona license number 15579, as entered by the provider. Search the Arizona Medical Board at https://www.azmd.gov/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Barbara J. Maccollum, M.D. prescribe under Medicare Part D?
In 2024, Barbara J. Maccollum, M.D. had 1,325 Medicare Part D claims for 374 beneficiaries; the average among gastroenterology physician prescribers was 811. Part D covers Medicare prescriptions only.
What is Barbara J. Maccollum, M.D.'s MIPS final score?
CMS assigned the neutral MIPS final score of 75 for 2023 without scoring any category, so it is not a measured result.
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.