Dr. Barbara Callahan, MD
- Medicare services, 2019
- 1,010
- Part D claims, 2019
- 12
- State licenses
- 3
- Year NPI issued
- 2006
- Practice address
- CA
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Find Dr. Callahan's professional email, personal email and mobile number
Dmand AI checks each channel through healthcare-specific waterfall enrichment. See what is on file with a free account, with practice phones, licenses and affiliations.
Dr. Barbara Callahan is an internist in California
Dr. Callahan practices in California.
Dr. Callahan's NPI, 1124111653, was assigned on October 2, 2006. Dr. Callahan graduated from LSU Health Sciences Center New Orleans - School of Medicine in 1982. Dr. Callahan holds California license C41130.
- NPI
- 1124111653NPI Registry (opens in a new tab)
- NPI enumeration date
- October 2, 2006
- NPI status
- Active
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Female
- Medical school graduation
- 1982
Sources: NPPES NPI Registry (CMS); and Dmand AI Professional Profile Data
Dmand AI tracks the EHR system at Dr. Barbara Callahan's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Callahan practices. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Dr. Callahan's practice | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Barbara Callahan is one of 16,751 internists in California
Internal medicine is Dr. Callahan's primary specialty in the NPI Registry, under taxonomy code 207R00000X. Dmand AI has Dr. Callahan's licenses on file in 3 states: California, Arizona and Louisiana.
Specialties and state licenses
- Internal medicine, CaliforniaPrimary
- Arizona license
- Louisiana license
Internists near Dr. Callahan
Counts of internists with a Dmand AI profile, by place and practice. Each opens the list.
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Dr. Barbara Callahan billed Medicare for 1,010 services in 2019
CMS data shows 1,010 Medicare services from Dr. Callahan across 10 procedure codes in 2019. Medicare paid $121,035 for them. Every service was in an office.
Dr. Callahan's Medicare services by type, 2019
- Office and hospital visits531
- Tests and treatments408
- Imaging71
Dr. Callahan compared with the California median for internists, 2019
- Dr. Callahan
- California median
- Medicare services
- 1,010vs 3612.8 times
- Part D claims
- 12vs 42197% below
Medians across 15,815 internists in California with Dmand AI profiles that report each measure.
Dr. Callahan's most billed Medicare procedure codes, 2019
CMS publishes codes billed for 11 or more Medicare patients. Each label is the code family; CPT descriptions are licensed by the AMA.
Need commercial claims for Dr. Callahan?
Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Callahan and other internists in California.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Barbara Callahan's patients have a median age of 75
Across all payers, Dmand AI patient panel data puts Dr. Callahan's median patient age at 75, with 100% women.
Dr. Callahan's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 75
Patient panel by sex, all payers
- Women100%
- Men0%
Source: Dmand AI Patient Panel Data
Dr. Barbara Callahan wrote 12 Medicare Part D claims in 2019
In 2019, Dr. Callahan wrote 12 Medicare Part D claims. Every claim was for a generic drug. They cover 1 drug, with $478 in total drug cost.
Dr. Callahan's most prescribed drugs by claims, 2019
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Source: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026
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Dr. Barbara Callahan graduated from LSU Health Sciences Center New Orleans - School of Medicine
Dr. Callahan graduated from LSU Health Sciences Center New Orleans - School of Medicine in 1982.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. Barbara Callahan's profile data
| Data on this page | Source |
|---|---|
| NPI, name, sex, specialty and licenses | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data |
| Medicare services and procedure codes | Medicare Physician & Other Practitioners - by Provider and Service (CMS) (opens in a new tab) |
| State medians for the same specialty | Dmand AI Peer Benchmarks |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel Data |
| Part D prescribing | Medicare Part D Prescribers - by Provider and Drug (CMS) (opens in a new tab) |
| Training, board certification and memberships | Dmand AI Professional Profile Data |
| EHR at each practice site | Dmand AI Technology Install Data |
| Similar physicians | Dmand AI Affiliation Data |
Data last refreshed October 2026Report an inaccuracyRemove my information
FAQ
Frequently asked questions about Dr. Barbara Callahan
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Dr. Barbara Callahan's NPI number?
Dr. Barbara Callahan's NPI number is 1124111653. It was assigned on October 2, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. Barbara Callahan?
Dr. Barbara Callahan is an internist in California. The primary specialty in the NPI Registry is Internal Medicine Physician (taxonomy code 207R00000X).
What is Dr. Barbara Callahan's medical license number?
Dr. Callahan holds California license C41130, one of the licenses on file in 3 states.
Which states has Dr. Barbara Callahan been licensed in?
Dmand AI has state licenses on file for Dr. Callahan in California (1983 to 2027), Arizona (1991 to 2001) and Louisiana (1982 to 1985).
Does Dr. Barbara Callahan accept Medicare?
Yes. CMS data shows Dr. Callahan billed Medicare for 1,010 services in 2019.
What services does Dr. Barbara Callahan bill to Medicare?
In 2019, Dr. Callahan's most billed Medicare services were office visit, new patient (99203), blood vessel study (93970) and blood vessel study (93880).
Where did Dr. Barbara Callahan go to medical school?
Dr. Callahan graduated from LSU Health Sciences Center New Orleans - School of Medicine in 1982.
What drugs does Dr. Barbara Callahan prescribe most?
In 2019 Medicare Part D data, Dr. Callahan's most prescribed drugs by claims were Oxycodone HCl.
How long has Dr. Barbara Callahan been practicing?
Dr. Callahan graduated from medical school in 1982, 44 years ago.
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