Dr. John Thomas Halloran, DO
- Medicare services, 2023
- 211
- Part D claims, 2024
- 934
- Hospital affiliations
- 1
- Industry payments
- $17
- Medical group
- 1
- Practice address
- 1031 Waterloo Road, Stockton, CA 95205
- Practice phone
- Call (209) 940-5600
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
CMC Waterloo
FQHC - Main Site · Stockton, California
Find Dr. Halloran'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. John Thomas Halloran is an internist in Stockton, California
Dr. Halloran practices at CMC Waterloo in Stockton, California.
Dr. Halloran's NPI, 1851888697, was assigned on April 17, 2018. Dr. Halloran graduated from Touro College of Osteopathic Medicine - New York in 2018. Dr. Halloran holds California license 20A19224.
- NPI
- 1851888697NPI Registry (opens in a new tab)
- Medicare PAC ID
- 1951793561
- NPI enumeration date
- April 17, 2018
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (209) 940-5600
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 34
- Medical school graduation
- 2018
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. John Thomas Halloran practices at CMC Waterloo in Stockton, California
Dr. Halloran's primary practice is CMC Waterloo, at 1031 Waterloo Road, Stockton, CA 95205 in San Joaquin County. The practice phone is (209) 940-5600.
- CMC Waterloo1031 Waterloo Road, Stockton, CA 95205 · San Joaquin CountyPhone(209) 940-5600
Source: Dmand AI Affiliation Data
Dr. John Thomas Halloran is affiliated with 2 sites of care and 1 medical group
Dr. Halloran's primary practice is CMC Waterloo in Stockton, California. Dr. Halloran is also affiliated with Adventist Health Lodi Memorial. The medical group on file is Esparto Family Practice. Dr. Halloran's employer is on file too: a community health center (fqhc).
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. John Thomas Halloran's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Halloran practices, 2 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| CMC Waterloo | Available with a free account |
| +1 more affiliated site | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. John Thomas Halloran is one of 16,751 internists in California
Internal medicine is Dr. Halloran's primary specialty in the NPI Registry, under taxonomy code 207R00000X. Dr. Halloran is board certified in internal medicine by the American Board of Internal Medicine. Dr. Halloran is licensed in California.
Specialties and state licenses
- Internal medicine, CaliforniaPrimary
Clinical focus
Dmand AI lists acid reflux, acute kidney failure, acute skin infection, anxiety, asthma, bipolar disorder, chronic anemia and chronic diabetes among the conditions Dr. Halloran treats.
Internists near Dr. Halloran
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. John Thomas Halloran billed Medicare for 211 services in 2023
CMS data shows 211 Medicare services from Dr. Halloran across 2 procedure codes in 2023, all of them office visits. Medicare paid $15,357 for them. Every service was in an office.
Dr. Halloran's Medicare services by type, 2022 to 2023
- 2022
- 2023
- Office and hospital visits
- 2022: 5662023: 21163%
- Lab and pathology
- 2022: 292023: 0100%
- Tests and treatments
- 2022: 492023: 0100%
- Other services
- 2022: 342023: 0100%
Dr. Halloran compared with the California median for internists, 2023
- Dr. Halloran
- California median
- Medicare services
- 211vs 36142% below
- Part D claims
- 570vs 42135% above
Medians across 15,815 internists in California with Dmand AI profiles that report each measure.
Dr. Halloran's most billed Medicare procedure codes, 2023
CMS publishes codes billed for 11 or more Medicare patients. Each label is the code family; CPT descriptions are licensed by the AMA.
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Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Halloran and other internists in California.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. John Thomas Halloran's patients have a median age of 50
Across all payers, Dmand AI patient panel data puts Dr. Halloran's median patient age at 50, with 57% women.
Dr. Halloran's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 50
Patient panel by sex, all payers
- Women57%
- Men43%
Source: Dmand AI Patient Panel Data
Dr. John Thomas Halloran wrote 934 Medicare Part D claims in 2024
In 2024, Dr. Halloran wrote 934 Medicare Part D claims for 156 patients. 83% of them were for generic drugs. CMS names the drug for 570 of them, across 21 drugs with 11 or more claims each, at $45,905 in total drug cost. In 2023, CMS named 1,430 claims across 52 drugs.
Dr. Halloran's Part D claims by kind of drug, 2024
- Generic775 claims83%
- Brand-name147 claims16%
- Other12 claims1%
Dr. Halloran's most prescribed drugs by claims, 2024
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Drug classes CMS tracks in Dr. Halloran's Part D claims, 2024
- Antibiotics1%13 of 934 claims
Share of all Part D claims for each drug class CMS reports on. Classes with no claims are left out.
Part D claims for drugs CMS names, 2023 to 2024
- 2023
- 2024
- Claims for drugs CMS names
- 2023: 1,4302024: 57060%
Drugs named by CMS: 21 in 2024, 52 in 2023.
Sources: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026; and Medicare Part D Prescribers - by Provider (CMS), 2024 data
How Dr. John Thomas Halloran takes part in Medicare
Dr. Halloran accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
Source: Doctors and Clinicians National Downloadable File (CMS)
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Dr. John Thomas Halloran received $17 in industry payments in 2025
CMS Open Payments shows 1 general payment to Dr. Halloran from 1 drug or device company in 2025. Food and beverage make up the largest share, 100% of the total. Exact Sciences Corporation paid the most, $17.
Companies that paid Dr. Halloran the most, 2025 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. John Thomas Halloran graduated from Touro College of Osteopathic Medicine - New York
Dr. Halloran graduated from Touro College of Osteopathic Medicine - New York in 2018.
- Medical school
- Board certified in internal medicine
- Board certified in 2021 - 2025
Source: Dmand AI Professional Profile Data
Dr. John Thomas Halloran accepts plans from 6 insurance carriers
Dr. Halloran is in network with 6 carriers, including Aetna, Blue Cross Blue Shield of Michigan and Elevance. PPO plans come from the most carriers, 6. Check the plan with the practice before a visit.
- Aetna
- Blue Cross Blue Shield of Michigan
- Elevance
- Blue Cross Blue Shield of Massachusetts
- HCSC
- Regence Health Plans
Plan types Dr. Halloran accepts, by number of carriers
- PPO6
- Medicare5
- HMO2
- POS2
- EPO1
Source: Dmand AI Insurance Network Data
Sources for Dr. John Thomas Halloran'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 |
| Practice locations and phone | Dmand AI Affiliation Data |
| Primary practice, affiliations and health system | Dmand AI Affiliation DataDmand AI Org Hierarchy 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)Medicare Part D Prescribers - by Provider (CMS) (opens in a new tab) |
| MIPS scores, telehealth, assignment and procedure percentiles | Doctors and Clinicians National Downloadable File (CMS) (opens in a new tab) |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| Training, board certification and memberships | Dmand AI Professional Profile Data |
| Insurance carriers and plan types | Dmand AI Insurance Network 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. John Thomas Halloran
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. John Thomas Halloran's NPI number?
Dr. John Thomas Halloran's NPI number is 1851888697. It was assigned on April 17, 2018, and it is active in the NPI Registry.
What kind of doctor is Dr. John Thomas Halloran?
Dr. John Thomas Halloran is an internist in Stockton, California. The primary specialty in the NPI Registry is Internal Medicine Physician (taxonomy code 207R00000X).
Where does Dr. John Thomas Halloran practice?
Dr. Halloran practices at 1031 Waterloo Road, Stockton, CA 95205. Dr. Halloran's primary practice is CMC Waterloo in Stockton, California.
What is Dr. John Thomas Halloran's office phone number?
The practice phone on file for Dr. Halloran is (209) 940-5600.
What is Dr. John Thomas Halloran's medical license number?
Dr. Halloran holds California license 20A19224.
Which hospitals is Dr. John Thomas Halloran affiliated with?
Dr. Halloran is affiliated with Adventist Health Lodi Memorial.
What medical group is Dr. John Thomas Halloran part of?
Dr. Halloran is linked to Esparto Family Practice.
Does Dr. John Thomas Halloran accept Medicare?
Yes. CMS data shows Dr. Halloran billed Medicare for 211 services in 2023, and Dr. Halloran accepts Medicare assignment.
Is Dr. John Thomas Halloran board certified?
Yes. Dr. Halloran is board certified in internal medicine by the American Board of Internal Medicine.
What services does Dr. John Thomas Halloran bill to Medicare?
In 2023, Dr. Halloran's most billed Medicare services were office visit, established patient (99214) and office visit, established patient (99213).
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Where did Dr. John Thomas Halloran go to medical school?
Dr. Halloran graduated from Touro College of Osteopathic Medicine - New York in 2018.
What drugs does Dr. John Thomas Halloran prescribe most?
In 2024 Medicare Part D data, Dr. Halloran's most prescribed drugs by claims were Atorvastatin Calcium, Amlodipine Besylate and Lisinopril.
Has Dr. John Thomas Halloran received payments from drug or device companies?
CMS Open Payments shows $17 in general payments to Dr. Halloran from 1 company from 2025 to 2025. The largest total came from Exact Sciences Corporation.
How long has Dr. John Thomas Halloran been practicing?
Dr. Halloran graduated from medical school in 2018, 8 years ago.
What insurance does Dr. John Thomas Halloran accept?
Dr. Halloran is in network with 6 carriers, including Aetna, Blue Cross Blue Shield of Michigan and Elevance. PPO plans come from the most carriers, 6. Check the plan with the practice before a visit.
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