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Dr. Daniel Joseph Barker, MD
NPI1538480116PAC ID7113160375
- Medicare services, 2024
- 476
- Medicare patients, 2024
- 178
- Part D claims, 2024
- 2,136
- Publications
- 2
- Hospital affiliations
- 4
- Practice address
- 330 Brookline Avenue, Boston, MA 02215
- Practice phone
- Call (617) 667-7000
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Find Dr. Barker'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. Daniel Joseph Barker is an internist in Boston, Massachusetts
Dr. Barker practices at Beth Israel Deaconess Medical Center in Boston, Massachusetts, part of Beth Israel Lahey Health.
Dr. Barker's NPI, 1538480116, was assigned on June 17, 2010. Dr. Barker graduated from University of Massachusetts Medical School in 2010. Dr. Barker holds Massachusetts license 243873.
NPI and contact details
- NPI
- 1538480116NPI Registry (opens in a new tab)
- Medicare PAC ID
- 7113160375
- NPI enumeration date
- June 17, 2010
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
- Practice phone
- (617) 667-7000
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 42
- Medical school graduation
- 2010
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Daniel Joseph Barker practices at Beth Israel Deaconess Medical Center in Boston, Massachusetts
Dr. Barker's primary practice is Beth Israel Deaconess Medical Center, at 330 Brookline Avenue, Boston, MA 02215 in Suffolk County. The practice phone is (617) 667-7000.
- Beth Israel Deaconess Medical Center330 Brookline Avenue, Boston, MA 02215 · Suffolk CountyPhone(617) 667-7000
Source: Dmand AI Affiliation Data
Dr. Daniel Joseph Barker is affiliated with 5 sites of care and 2 medical groups
Dr. Barker's primary practice is Beth Israel Deaconess Medical Center in Boston, Massachusetts, part of Beth Israel Lahey Health. Dr. Barker is also affiliated with Massachusetts General Hospital. The medical group on file is Harvard Medical Faculty Physicians at Beth Israel Deaconess Medical Center (HMFP). Dmand AI also links Dr. Barker to 2 more hospitals, 1 home health agency and 1 medical group, each named with a free account.
Massachusetts General HospitalHarvard Medical Faculty Physicians at Beth Israel Deaconess Medical Center (HMFP)2 hospitalsNames with a free account1 home health agencyName with a free account1 medical groupName with a free account
See all 7 affiliations for Dr. BarkerSources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Daniel Joseph Barker's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Barker practices, 5 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Beth Israel Deaconess Medical Center | Available with a free account |
| +4 more sites and 1 medical group | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Daniel Joseph Barker is one of 5,528 internists in Massachusetts
Internal medicine is Dr. Barker's primary specialty in the NPI Registry, under taxonomy code 207R00000X. Dr. Barker is licensed in Massachusetts.
Specialties and state licenses
- Internal medicine, MassachusettsPrimary
Internists near Dr. Barker
Counts of internists with a Dmand AI profile, by place and practice. Each opens the list.
5,528internists in Massachusetts1,712internists in Boston188internists at Beth Israel Deaconess Medical Center
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Dr. Daniel Joseph Barker billed Medicare for 476 services in 2024
CMS data shows 476 Medicare services from Dr. Barker across 6 procedure codes in 2024, for 178 Medicare patients. Medicare paid $25,925 for them.
Medicare services, 2024476
Medicare patients178
Paid by Medicare$25,925
Procedure codes6
Dr. Barker's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Other services
- 2023: 782024: 265240%
- Office and hospital visits
- 2023: 2222024: 2115%
Where Dr. Barker's Medicare services took place, 2024
- In an office143%
- In a facility46297%
Dr. Barker compared with the Massachusetts median for internists, 2024
- Dr. Barker
- Massachusetts median
- Medicare services
- 476vs 43110% above
- Medicare patients
- 178vs 1948% below
- Part D claims
- 1,710vs 4024.3 times
Medians across 5,369 internists in Massachusetts with Dmand AI profiles that report each measure.
Dr. Barker'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.
Need commercial claims for Dr. Barker?
Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Barker and other internists in Massachusetts.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Daniel Joseph Barker treated 178 Medicare patients in 2024, average age 73
CMS counts 178 Medicare patients who saw Dr. Barker in 2024. The largest group is 75 to 84, with 75 patients. 70% of them have high blood pressure, and 66% have high cholesterol. 22% are also on Medicaid. Their average risk score is 1.22, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Dr. Barker's median patient age at 62, with 44% women.
Medicare patients, 2024178
Average age73
Average risk score1.22
Also on Medicaid22%
Dr. Barker's Medicare patients by age, 2024
Dr. Barker's Medicare patients by sex, 2024
- Women8749%
- Men9151%
Chronic conditions among Dr. Barker's Medicare patients, 2024
- High blood pressure70%
- High cholesterol66%
- Arthritis44%
- Mood disorders30%
- Anxiety29%
- Diabetes29%
- Depression28%
- Ischemic heart disease23%
Share of Medicare patients with each condition. A patient can have several.
Dr. Barker's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 62
Patient panel by sex, all payers
- Women44%
- Men56%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Daniel Joseph Barker wrote 2,136 Medicare Part D claims in 2024
In 2024, Dr. Barker wrote 2,136 Medicare Part D claims for 244 patients. 90% of them were for generic drugs. CMS names the drug for 1,710 of them, across 51 drugs with 11 or more claims each, at $86,354 in total drug cost. In 2023, CMS named 1,619 claims across 45 drugs.
Part D claims, 20242,136
Drugs named by CMS51
Total drug cost$86,354
Part D patients244
Dr. Barker's Part D claims by kind of drug, 2024
- Generic1,931 claims90%
- Brand-name194 claims9%
- Other11 claims1%
Dr. Barker'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. Barker's Part D claims, 2024
- Opioids3%74 of 2,136 claims
- Antibiotics1%15 of 2,136 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: 1,6192024: 1,7106%
Drugs named by CMS: 51 in 2024, 45 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
Dr. Daniel Joseph Barker offers telehealth to Medicare patients
Dr. Barker accepts Medicare assignment, so Medicare's approved amount is taken as full payment. CMS lists Dr. Barker as offering telehealth.
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
Source: Doctors and Clinicians National Downloadable File (CMS)
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Dr. Daniel Joseph Barker has 2 publications on record
Dmand AI links 2 papers to Dr. Barker, published from 2012 to 2025. Dr. Barker's most frequent co-author is Aaron P. Gould, MD.
Papers2
Years published2012 to 2025
Dr. Barker's most frequent co-authors
Recent publications by Dr. Barker
See who Dr. Barker researches with
Physician Network Discovery turns co-authorship, shared hospitals and shared groups into a map of who Dr. Barker works with, so you can find a warm path to the right internists.
Sources: PubMed (National Library of Medicine); and Dmand AI Research Linkage
Dr. Daniel Joseph Barker graduated from University of Massachusetts Medical School
Dr. Barker graduated from University of Massachusetts Medical School in 2010.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. Daniel Joseph Barker'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) |
| Publications, topics and co-authors | PubMed (National Library of Medicine) (opens in a new tab)Dmand AI Research Linkage |
| 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. Daniel Joseph Barker
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. Daniel Joseph Barker's NPI number?
Dr. Daniel Joseph Barker's NPI number is 1538480116. It was assigned on June 17, 2010, and it is active in the NPI Registry.
What kind of doctor is Dr. Daniel Joseph Barker?
Dr. Daniel Joseph Barker is an internist in Boston, Massachusetts. The primary specialty in the NPI Registry is Internal Medicine Physician (taxonomy code 207R00000X).
Where does Dr. Daniel Joseph Barker practice?
Dr. Barker practices at 330 Brookline Avenue, Boston, MA 02215. Dr. Barker's primary practice is Beth Israel Deaconess Medical Center in Boston, Massachusetts, part of Beth Israel Lahey Health. Dmand AI also links Dr. Barker to 2 hospitals, 1 home health agency and 1 medical group.
What is Dr. Daniel Joseph Barker's office phone number?
The practice phone on file for Dr. Barker is (617) 667-7000.
What is Dr. Daniel Joseph Barker's medical license number?
Dr. Barker holds Massachusetts license 243873.
Which hospitals is Dr. Daniel Joseph Barker affiliated with?
Dr. Barker practices at Beth Israel Deaconess Medical Center in Boston, Massachusetts. Dr. Barker is also affiliated with Massachusetts General Hospital. Dmand AI links Dr. Barker to 2 more hospitals.
What medical group is Dr. Daniel Joseph Barker part of?
Dr. Barker is linked to Harvard Medical Faculty Physicians at Beth Israel Deaconess Medical Center (HMFP). Dmand AI links Dr. Barker to 1 more medical group.
Does Dr. Daniel Joseph Barker accept Medicare?
Yes. CMS data shows Dr. Barker billed Medicare for 476 services in 2024, and Dr. Barker accepts Medicare assignment.
Does Dr. Daniel Joseph Barker offer telehealth?
Yes. The CMS Doctors and Clinicians file lists Dr. Barker as offering telehealth services.
How many Medicare patients does Dr. Daniel Joseph Barker see?
CMS counts 178 Medicare patients who saw Dr. Barker in 2024, with an average age of 73.
Show 6 more questionsShow fewer questions
What services does Dr. Daniel Joseph Barker bill to Medicare?
In 2024, Dr. Barker's most billed Medicare services were office visit, established patient (99214), medicare service (G2211) and medicare service (G0439).
Where did Dr. Daniel Joseph Barker go to medical school?
Dr. Barker graduated from University of Massachusetts Medical School in 2010.
What drugs does Dr. Daniel Joseph Barker prescribe most?
In 2024 Medicare Part D data, Dr. Barker's most prescribed drugs by claims were Atorvastatin Calcium, Amlodipine Besylate and Lisinopril.
How long has Dr. Daniel Joseph Barker been practicing?
Dr. Barker graduated from medical school in 2010, 16 years ago.
Does Dr. Daniel Joseph Barker do research?
Dmand AI links 2 publications to Dr. Barker, published from 2012 to 2025.
Who does Dr. Daniel Joseph Barker publish with?
Dr. Barker's most frequent co-authors are Aaron P. Gould, MD (1 shared paper).
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