Dr. Christopher F. Calahan, MD
- Medicare services, 2024
- 12
- Medicare patients, 2024
- 16
- Part D claims, 2024
- 17
- Hospital affiliations
- 3
- Medical groups
- 6
- Practice address
- 300 Longwood Avenue, Boston, MA 02115
- Practice phone
- Call (617) 735-6000
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Find Dr. Calahan's professional email, personal email and mobile number
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Dr. Christopher F. Calahan is an internist in Boston, Massachusetts
Dr. Calahan practices at Boston Children's Hospital in Boston, Massachusetts, part of The Children's Hospital.
Dr. Calahan's NPI, 1558821983, was assigned on March 21, 2019. Dr. Calahan graduated from Harvard Medical School in 2019. Dr. Calahan holds Massachusetts license 1018450.
- NPI
- 1558821983NPI Registry (opens in a new tab)
- Medicare PAC ID
- 0345782298
- NPI enumeration date
- March 21, 2019
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (617) 735-6000
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 33
- Medical school graduation
- 2019
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Christopher F. Calahan practices at Boston Children's Hospital in Boston, Massachusetts
Dr. Calahan's primary practice is Boston Children's Hospital, at 300 Longwood Avenue, Boston, MA 02115 in Suffolk County. The practice phone is (617) 735-6000.
- Boston Children's Hospital300 Longwood Avenue, Boston, MA 02115 · Suffolk CountyPhone(617) 735-6000
Source: Dmand AI Affiliation Data
Dr. Christopher F. Calahan is affiliated with 4 sites of care and 6 medical groups
Dr. Calahan's primary practice is Boston Children's Hospital in Boston, Massachusetts, part of The Children's Hospital. Dr. Calahan is also affiliated with Massachusetts General Hospital. The medical group on file is Massachusetts General Physicians Organization (MGPO). Dmand AI also links Dr. Calahan to 1 more hospital, 5 medical groups and 1 dialysis center, each named with a free account.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Christopher F. Calahan's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Calahan practices, 4 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Boston Children's Hospital | Available with a free account |
| +3 more sites and 5 medical groups | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Christopher F. Calahan is one of 5,528 internists in Massachusetts
Internal medicine is Dr. Calahan's primary specialty in the NPI Registry, under taxonomy code 207R00000X. Dr. Calahan is licensed in Massachusetts.
Specialties and state licenses
- Internal medicine, MassachusettsPrimary
Internists near Dr. Calahan
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. Christopher F. Calahan billed Medicare for 12 services in 2024
CMS data shows 12 Medicare services from Dr. Calahan across 1 procedure code in 2024, for 16 Medicare patients. Medicare paid $1,732 for them. Every service was in a facility, such as a hospital, rather than an office.
Dr. Calahan compared with the Massachusetts median for internists, 2024
- Dr. Calahan
- Massachusetts median
- Medicare services
- 12vs 43197% below
- Medicare patients
- 16vs 19492% below
- Part D claims
- 14vs 40297% below
Medians across 5,369 internists in Massachusetts with Dmand AI profiles that report each measure.
Dr. Calahan's most billed Medicare procedure codes, 2024
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. Calahan and other internists in Massachusetts.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Christopher F. Calahan treated 16 Medicare patients in 2024, average age 80
CMS counts 16 Medicare patients who saw Dr. Calahan in 2024. 75% of them have arthritis, and 75% have high blood pressure. Their average risk score is 2.39, where 1.00 is the Medicare average, so they are sicker than most Medicare patients.
Across all payers, Dmand AI patient panel data puts Dr. Calahan's median patient age at 6, with 45% women.
Chronic conditions among Dr. Calahan's Medicare patients, 2024
- Arthritis75%
- High blood pressure75%
- High cholesterol75%
Share of Medicare patients with each condition. A patient can have several.
Dr. Calahan's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 6
Patient panel by sex, all payers
- Women45%
- Men55%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Christopher F. Calahan wrote 17 Medicare Part D claims in 2024
In 2024, Dr. Calahan wrote 17 Medicare Part D claims. 65% of them were for generic drugs. CMS names the drug for 14 of them, across 1 drug with 11 or more claims each, at $13,734 in total drug cost.
Dr. Calahan's Part D claims by kind of drug, 2024
- Generic11 claims65%
- Brand-name and other6 claims35%
Dr. Calahan's most prescribed drugs by claims, 2023
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
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. Christopher F. Calahan takes part in Medicare
Dr. Calahan 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. Christopher F. Calahan graduated from Harvard Medical School
Dr. Calahan graduated from Harvard Medical School in 2019.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. Christopher F. Calahan'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 DataMedicare Physician & Other Practitioners - by Provider (CMS) (opens in a new tab) |
| 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) |
| 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. Christopher F. Calahan
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. Christopher F. Calahan's NPI number?
Dr. Christopher F. Calahan's NPI number is 1558821983. It was assigned on March 21, 2019, and it is active in the NPI Registry.
What kind of doctor is Dr. Christopher F. Calahan?
Dr. Christopher F. Calahan is an internist in Boston, Massachusetts. The primary specialty in the NPI Registry is Internal Medicine Physician (taxonomy code 207R00000X).
Where does Dr. Christopher F. Calahan practice?
Dr. Calahan practices at 300 Longwood Avenue, Boston, MA 02115. Dr. Calahan's primary practice is Boston Children's Hospital in Boston, Massachusetts, part of The Children's Hospital. Dmand AI also links Dr. Calahan to 1 hospital, 5 medical groups and 1 dialysis center.
What is Dr. Christopher F. Calahan's office phone number?
The practice phone on file for Dr. Calahan is (617) 735-6000.
What is Dr. Christopher F. Calahan's medical license number?
Dr. Calahan holds Massachusetts license 1018450.
Which hospitals is Dr. Christopher F. Calahan affiliated with?
Dr. Calahan practices at Boston Children's Hospital in Boston, Massachusetts. Dr. Calahan is also affiliated with Massachusetts General Hospital. Dmand AI links Dr. Calahan to 1 more hospital.
What medical group is Dr. Christopher F. Calahan part of?
Dr. Calahan is linked to Massachusetts General Physicians Organization (MGPO). Dmand AI links Dr. Calahan to 5 more medical groups.
Does Dr. Christopher F. Calahan accept Medicare?
Yes. CMS data shows Dr. Calahan billed Medicare for 12 services in 2024, and Dr. Calahan accepts Medicare assignment.
How many Medicare patients does Dr. Christopher F. Calahan see?
CMS counts 16 Medicare patients who saw Dr. Calahan in 2024, with an average age of 80.
What services does Dr. Christopher F. Calahan bill to Medicare?
In 2024, Dr. Calahan's most billed Medicare services were hospital inpatient care (99223).
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Where did Dr. Christopher F. Calahan go to medical school?
Dr. Calahan graduated from Harvard Medical School in 2019.
What drugs does Dr. Christopher F. Calahan prescribe most?
In 2023 Medicare Part D data, Dr. Calahan's most prescribed drugs by claims were Trulicity.
How long has Dr. Christopher F. Calahan been practicing?
Dr. Calahan graduated from medical school in 2019, 7 years ago.
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