Dr. Daniel Joseph Barker , MD
Internal Medicine โข Boston, MA
330 Brookline Ave, Deaconess 311
Boston, MA 022155400
This profile restates public CMS/NPPES data; T-MedInfo gives no medical advice — consult a licensed professional, and call 911 for emergencies.
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Dr. Daniel Barker is listed in NPPES under Internal Medicine.
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NPI assigned on June 17, 2010; this date does not establish years in practice.
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Published CMS data list 476 Original Medicare Part B services in 2024.
Source: CMS, Medicare Physician & Other Practitioners โ by Provider and Service, 2024. Published rows only; this is not a quality measure.
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Published Part B service records, 2024:
- 99214 โ Established patient outpatient office visit: 178 service units.
- G2211 โ Visit complexity inherent to evaluation and management associated with medical care services that serve as the continuing focal point for all needed health care services and/or with medical care services that are part of ongoing care related to a patient's: 143 service units.
- G0439 โ Annual wellness visit, includes a personalized prevention plan of service (pps), subsequent visit: 65 service units.
Source: CMS, Medicare Physician & Other Practitioners โ by Provider and Service, 2024. Units differ by code; these are not visits or a measure of quality.
CPTยฎ only copyright 2023 American Medical Association. All rights reserved. Service names are shortened from CPT Consumer Friendly Descriptors (CMS data, 2024). CPT notice
See all 7 records in the table ยท Guide: How to read Medicare Part B data
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Published CMS data list 1,710 Medicare Part D prescriptions, including refills, in 2024.
Source: CMS, Medicare Part D Prescribers โ by Provider and Drug, 2024. Published rows only; this is not a quality measure.
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Published Part D records, 2024:
- Atorvastatin Calcium โ 240 prescription fills, including refills.
- Amlodipine Besylate โ 142 prescription fills, including refills.
- Lisinopril โ 135 prescription fills, including refills.
Source: CMS, Medicare Part D Prescribers โ by Provider and Drug, 2024. Drug names come from pharmacy claims. Listing a drug here is not an endorsement or a recommendation.
See all 51 records in the table ยท Guide: How to read Medicare Part D prescriber data
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More Medicare Part B services than 70% of clinicians listed under Internal Medicine in Boston, MA (2024, 1,138 clinicians with data). Median for this group: 230. Middle half: 108 to 528.
Close to the middle for Medicare Part B services among clinicians listed under Internal Medicine in Massachusetts (2024, 3,795 clinicians with data). Median for this group: 524. Middle half: 200 to 1,073.
Source: CMS, Medicare Physician & Other Practitioners โ by Provider and Service, 2024. Billing and prescribing volume is not a quality rating.
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Medicare Part B services went from 335 in 2020 to 476 in 2024.
Source: CMS, Medicare Physician & Other Practitioners โ by Provider and Service, 2020โ2024.
Practice Location & Contact Primary Location
330 Brookline Ave
Deaconess 311
Boston, MA 022155400
Matched by practice address or phone in NPPES. A shared address or phone does not confirm that this clinician works there.
CMS Doctors and Clinicians lists 2 distinct group names: Beth Israel Deaconess Medical Center Inc; Harvard Medical Faculty Phys At Beth Israel Deaconess Med Ctr Inc. See the list
Source: CMS Doctors and Clinicians National Downloadable File, release date unavailable.
Listings do not confirm current availability, employment or a shared ownership network.
Medicare Profile & Education
Source: CMS Doctors and Clinicians National Downloadable File
University Of Massachusetts Medical School
2010
What Public CMS Data Show
Internal Medicine: NPPES taxonomy is a reported classification, not proof of board certification.
Medicare patients
178 people with Original Medicare in 2024
It gives a sense of how many people with Medicare this clinician treated that year.
Source: CMS, Medicare Physician & Other Practitioners โ by Provider, 2024.
Medicare-allowed amount
About $32,722 in 2024
The total amount Medicare approved for these services in 2024. It includes what Medicare paid and what patients or their other insurance owed, such as the deductible and coinsurance.
It shows the total cost of this clinician's Original Medicare services under Medicare's fee rules.
What this does not show: Medicare-allowed amount
This is not the clinician's income. Part of it can go to a clinic or group practice, staff, equipment or drugs. It is not the price you will pay.
Source: CMS, Medicare Physician & Other Practitioners โ by Provider and Service, 2024.
Paid by Medicare
About $25,925 in 2024
The part of the Medicare-allowed amount that Medicare itself paid in 2024, after patients' deductibles and coinsurance.
The gap between the allowed amount and this number is roughly what patients and their other insurance paid.
What this does not show: Paid by Medicare
This is not the clinician's income and not a measure of quality.
Source: CMS, Medicare Physician & Other Practitioners โ by Provider and Service, 2024.
30-day fills
4,285 standardized 30-day fills in 2024
CMS converts prescriptions to 30-day supplies so they can be compared. A 90-day prescription counts as about three 30-day fills.
What this does not show: 30-day fills
It is not a count of patients and not a measure of quality.
Part D drug cost
$86,354 in 2024
The total cost of these prescriptions in 2024, paid by Medicare drug plans, patients and other payers together.
It shows the total spending on drugs this clinician prescribed, not what any one patient paid.
What this does not show: Part D drug cost
A higher cost often reflects the type of medicines a specialty uses. It is not your out-of-pocket cost and not a measure of quality.
Source: CMS, Medicare Part D Prescribers โ by Provider and Drug, 2024.
Industry payments (Open Payments)
No Open Payments records are listed for this clinician for 2019โ2025.
Years since graduation
16 years (graduated 2010)
CMS Doctors and Clinicians data list 2010 as the year this clinician finished professional school.
It tells you roughly how long ago the clinician finished school.
What this does not show: Years since graduation
It is not the number of years in practice, and more years does not mean better care.
Source: CMS Doctors and Clinicians National Downloadable File.
NPI first issued
2010
The year this clinician's National Provider Identifier (NPI) was issued. An NPI is a unique 10-digit ID that US health care providers use for billing.
What this does not show: NPI first issued
NPIs have been issued only since 2005, so this year is not necessarily when the clinician started practicing.
Source: CMS NPPES NPI Registry.
Accepts Medicare assignment
CMS data list this clinician as accepting Medicare assignment. This means agreeing to take the Medicare-approved amount as full payment for covered services.
With Original Medicare, you usually pay only your deductible and coinsurance, and the office sends the claim to Medicare for you.
Medicare assignment applies to Original Medicare. It does not tell you whether the clinician is in a Medicare Advantage plan's network, accepts other insurance, or is taking new patients.
Source: CMS Doctors and Clinicians; Medicare.gov, โDoes your provider accept Medicare as full payment?โ
Telehealth (some services)
Recent Medicare claims show this clinician provided some services by telehealth, such as a video or phone visit.
You may be able to have some visits without going to the office. Ask which visits can be done by telehealth.
What this does not show: Telehealth (some services)
It does not mean all services are offered by telehealth, or that telehealth is covered by your plan.
Source: CMS, Telehealth Indicator on Medicare Care Compare (fact sheet, January 2023); CMS Doctors and Clinicians.
Enrolled in Medicare (PECOS)
Dr. Barker has a Medicare enrollment record in PECOS, the CMS system clinicians use to enroll so they can bill Medicare or order services for people with Medicare.
It does not show whether the clinician accepts assignment, is in your plan's network, or is taking new patients.
Source: CMS Medicare Fee-For-Service Public Provider Enrollment (PECOS); CMS Order and Referring file.
Can order Medicare-covered services
CMS lists Dr. Barker as eligible to order or refer Medicare Part B clinical laboratory and imaging services, durable medical equipment (DME) and home health services for people with Medicare.
Medicare pays for these items and services only when they are ordered by an eligible clinician.
What this does not show: Can order Medicare-covered services
It does not mean the clinician offers these services directly.
Source: CMS Medicare Fee-For-Service Public Provider Enrollment (PECOS); CMS Order and Referring file.
Compared with the same specialty in Boston and Massachusetts
Billing and prescribing volume is not a quality rating.
Medicare Part B services
More Medicare Part B services than 70% of clinicians listed under Internal Medicine in Boston, MA (2024, 1,138 clinicians with data). Median for this group: 230. Middle half: 108 to 528.
Close to the middle for clinicians listed under Internal Medicine in Massachusetts (2024, 3,795 clinicians with data). Median for this group: 524. Middle half: 200 to 1,073.
Medicare-allowed amount
A higher Medicare-allowed amount than 60% of clinicians listed under Internal Medicine in Boston, MA (2024, 1,138 clinicians with data). Median for this group: $23,760. Middle half: $10,686 to $49,412.
A lower Medicare-allowed amount than 60% of clinicians listed under Internal Medicine in Massachusetts (2024, 3,795 clinicians with data). Median for this group: $50,126. Middle half: $19,685 to $96,485.
Paid by Medicare
A higher Medicare payment amount than 60% of clinicians listed under Internal Medicine in Boston, MA (2024, 1,138 clinicians with data). Median for this group: $18,125. Middle half: $8,159 to $37,798.
A lower Medicare payment amount than 60% of clinicians listed under Internal Medicine in Massachusetts (2024, 3,795 clinicians with data). Median for this group: $38,152. Middle half: $14,838 to $74,912.
Medicare Part D prescriptions
More Part D prescriptions than 75% of clinicians listed under Internal Medicine in Boston, MA (2024, 1,038 clinicians with data). Median for this group: 341. Middle half: 68 to 1,461.
Close to the middle for clinicians listed under Internal Medicine in Massachusetts (2024, 3,672 clinicians with data). Median for this group: 1,174. Middle half: 129 to 3,740.
Part D drug cost
Close to the middle for clinicians listed under Internal Medicine in Boston, MA (2024, 1,038 clinicians with data). Median for this group: $55,608. Middle half: $2,852 to $214,435.
Close to the middle for clinicians listed under Internal Medicine in Massachusetts (2024, 3,672 clinicians with data). Median for this group: $103,819. Middle half: $9,088 to $319,703.
2,320 active clinicians are listed under Internal Medicine with a practice address in Boston, MA (6,830 in Massachusetts).
Addresses are self-reported to NPPES and may be out of date.
Telehealth indicator in Boston
25.4% of these 2,320 clinicians have the CMS telehealth indicator.
55.3% of these 2,320 clinicians are listed by CMS as accepting Medicare assignment.
CMS data by year
Changes may reflect reporting, coverage or privacy limits, not changes in care quality.
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Medicare Part B services
Medicare Part B services increased 42% from 335 in 2020 to 476 in 2024.
- 2020: 335
- 2021: 379
- 2022: 349
- 2023: 300
- 2024: 476
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Medicare-allowed amount
Medicare-allowed amount increased 16% from $28,112 in 2020 to $32,722 in 2024.
- 2020: $28,112
- 2021: $41,674
- 2022: $38,413
- 2023: $33,753
- 2024: $32,722
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Paid by Medicare
Paid by Medicare increased 26% from $20,541 in 2020 to $25,925 in 2024.
- 2020: $20,541
- 2021: $31,719
- 2022: $29,266
- 2023: $26,826
- 2024: $25,925
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Medicare Part D prescriptions
Medicare Part D prescriptions increased 26% from 1,357 in 2020 to 1,710 in 2024.
- 2020: 1,357
- 2021: 1,516
- 2022: 1,608
- 2023: 1,619
- 2024: 1,710
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30-day fills
30-day fills increased 35% from 3,164 in 2020 to 4,285 in 2024.
- 2020: 3,164
- 2021: 3,624
- 2022: 3,927
- 2023: 3,939
- 2024: 4,285
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Part D drug cost
Part D drug cost increased 61% from $53,537 in 2020 to $86,354 in 2024.
- 2020: $53,537
- 2021: $59,836
- 2022: $99,320
- 2023: $122,574
- 2024: $86,354
Sources: CMS Medicare Physician & Other Practitioners (2024), CMS Medicare Part D Prescribers (2024), CMS Doctors and Clinicians, CMS NPPES NPI Registry. Specialty names follow the NUCC Health Care Provider Taxonomy.
Text: T-MedInfo ยท Report an error.
Performed Procedures & Service Volume
CPTยฎ is a registered trademark of the American Medical Association. CPT codes, descriptions and other data only are copyright 2016โ2023 American Medical Association. All rights reserved. Applicable FARS/HHSARS apply. Descriptions of CPT codes are the AMA's CPT Consumer Friendly Descriptors as published by CMS in the Medicare Physician & Other Practitioners โ by Provider and Service data, 2017โ2024; they are plain-language summaries, not for clinical coding or documentation. HCPCS Level II codes and descriptions are from CMS. Fee schedules, relative value units, conversion factors and/or related components are not assigned by the AMA, are not part of CPT, and the AMA is not recommending their use. The AMA does not directly or indirectly practice medicine or dispense medical services. The AMA assumes no liability for data contained or not contained herein.
| HCPCS Code | Services | Patients | Submitted Charge | Medicare Allowed |
|---|---|---|---|---|
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99214
Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more
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178 | 129 | $326.00 | $102.12 |
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G2211
Visit complexity inherent to evaluation and management associated with medical care services that serve as the continuing focal point for all needed health care services and/or with medical care services that are part of ongoing care related to a patient's
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143 | 124 | $52.00 | $17.32 |
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G0439
Annual wellness visit, includes a personalized prevention plan of service (pps), subsequent visit
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65 | 65 | $446.00 | $141.33 |
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99213
Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more
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33 | 33 | $221.00 | $67.56 |
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G0444
Annual depression screening, 5 to 15 minutes
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23 | 23 | $31.00 | $9.54 |
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G0442
Annual alcohol misuse screening, 5 to 15 minutes
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20 | 20 | $31.00 | $9.54 |
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G2211
Visit complexity inherent to evaluation and management associated with medical care services that serve as the continuing focal point for all needed health care services and/or with medical care services that are part of ongoing care related to a patient's
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14 | 14 | $52.00 | $17.24 |
Source: CMS Part B by Provider and Service, 2024; services under 11 beneficiaries omitted by CMS. Privacy limits
Submitted charges are billed amounts, not a price quote for your visit.
Medicare Part D Prescribing Profile & Medications
Medicare Part D prescriptions filled, including refills, in 2024.
| Brand Name | Generic Name | Prescriptions | Day Supply | Total Cost | Patients |
|---|---|---|---|---|---|
| Atorvastatin Calcium | Atorvastatin Calcium | 240 | 20,609 | $3,611.13 | 74 |
| Amlodipine Besylate | Amlodipine Besylate | 142 | 12,594 | $1,115.60 | 48 |
| Lisinopril | Lisinopril | 135 | 11,690 | $1,260.26 | 40 |
| Omeprazole | Omeprazole | 88 | 7,000 | $1,414.56 | 29 |
| Levothyroxine Sodium | Levothyroxine Sodium | 76 | 5,520 | $434.41 | 21 |
| Gabapentin | Gabapentin | 67 | 2,714 | $1,701.80 | 13 |
| Simvastatin | Simvastatin | 66 | 4,487 | $501.32 | 16 |
| Metformin Hcl | Metformin Hcl | 43 | 3,594 | $397.18 | 12 |
| Metoprolol Succinate | Metoprolol Succinate | 38 | 2,862 | $716.85 | 11 |
| Metformin Hcl Er | Metformin Hcl | 37 | 3,330 | $404.85 | 13 |
| Losartan Potassium | Losartan Potassium | 36 | 3,240 | $459.97 | 15 |
| Chlorthalidone | Chlorthalidone | 34 | 2,830 | $821.31 | โ |
| Oxycodone Hcl | Oxycodone Hcl | 33 | 613 | $283.05 | โ |
| Albuterol Sulfate Hfa | Albuterol Sulfate | 33 | 1,883 | $1,661.94 | 14 |
| Tamsulosin Hcl | Tamsulosin Hcl | 31 | 2,654 | $530.76 | โ |
| Hydrochlorothiazide | Hydrochlorothiazide | 30 | 2,520 | $131.47 | 11 |
| Trazodone Hcl | Trazodone Hcl | 29 | 2,295 | $343.33 | โ |
| Rosuvastatin Calcium | Rosuvastatin Calcium | 29 | 2,608 | $659.31 | โ |
| Jardiance | Empagliflozin | 26 | 1,559 | $27,223.81 | โ |
| Pantoprazole Sodium | Pantoprazole Sodium | 24 | 1,196 | $189.34 | โ |
| Escitalopram Oxalate | Escitalopram Oxalate | 22 | 1,980 | $422.52 | โ |
| Finasteride | Finasteride | 22 | 1,939 | $349.18 | โ |
| Allopurinol | Allopurinol | 21 | 1,288 | $230.13 | โ |
| Lorazepam | Lorazepam | 21 | 400 | $90.11 | 13 |
| Famotidine | Famotidine | 21 | 1,410 | $169.03 | โ |
(top 25 shown)
Source: CMS Part D by Provider and Drug, 2024; rows below 11 claims omitted by CMS; volume isn’t quality. Privacy limits
Specialties & License Numbers Reported to NPPES
NUCC Taxonomy Code: 207R00000X
A physician who provides long-term, comprehensive care in the office and the hospital, managing both common and complex illness of adolescents, adults and the elderly. Internists are trained in the diagnosis and treatment of cancer, infections and diseases affecting the heart, blood, kidneys, joints and digestive, respiratory and vascular systems. They are also trained in the essentials of primary care internal medicine, which incorporates an understanding of disease prevention, wellness, substance abuse, mental health and effective treatment of common problems of the eyes, ears, skin, nervous system and reproductive organs.
Medicare (PECOS) Enrollment & Ordering Eligibility
Source: CMS PECOSPRACTITIONER - INTERNAL MEDICINE
I20130909000084
MA
7113160375
Sources: CMS Provider Enrollment and Order and Referring. Medicare enrollment is a billing status, not an accreditation or quality rating.
Medicare Group Practice Enrollments
Source: CMS Doctors and Clinicians National Downloadable File
Harvard Medical Faculty Phys At Beth Israel Deaconess Med Ctr Inc
330 Brookline Ave, Boston, MA 022155400
Beth Israel Deaconess Medical Center Inc
330 Brookline Ave, Boston, MA 022155400
Phone: 6176672000
Harvard Medical Faculty Phys At Beth Israel Deaconess Med Ctr Inc
330 Brookline Ave, Boston, MA 022155400
Phone: 6177548612
Clinicians Sharing This Practice Address or Phone
Clinicians sharing this NPPES address, phone or fax; a shared contact does not mean they work together.
Internal Medicine
Doctor of Medicine (M.D.)
Internal Medicine
Doctor of Medicine (M.D.)
Internal Medicine
Doctor of Medicine (M.D.)
Internal Medicine
Doctor of Medicine (M.D.)
Internal Medicine
Doctor of Medicine (M.D.)
Internal Medicine
Doctor of Medicine (M.D.)
Career & Practice History
NPI enumerated June 17, 2010.
No changes to the name, practice address, taxonomy or NPI status in this record have been observed in the monthly NPPES data files from January 2017 to August 2026.
NPI Administrative Meta
Other Internal Medicine Providers in Boston
- Dr. Karina Verma, MD
- Dr. Taimoor Jamil, MD
- Dr. Evan Tschirhart, MD
- Dr. Karina Ruiz-Esteves, MD
- Dr. Larissa Nekhlyudov, MD
- Dr. Belinda Chan, MD
Mailing Address
77 Pond Ave, Unit 605
Brookline, MA 024457141
Phone: 7817248833