Dr. Michael K Rees , MD
Internal Medicine • Brookline, MA
637 Washington St
Brookline, MA 024464500
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. Michael Rees is listed in NPPES under Internal Medicine.
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NPI assigned on August 22, 2006; this date does not establish years in practice.
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Published CMS data list 144 Original Medicare Part B services in 2018.
Source: CMS, Medicare Physician & Other Practitioners – by Provider and Service, 2018. Published rows only; this is not a quality measure.
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Published Part B service records, 2018:
- G0008 — Administration of influenza virus vaccine: 65 service units.
- 90662 — Influenza vaccine split virus, preservative free: 58 service units.
- 85610 — Blood test, clotting time: 21 service units.
Source: CMS, Medicare Physician & Other Practitioners – by Provider and Service, 2018. Units differ by code; these are not visits or a measure of quality.
CPT® only copyright 2017 American Medical Association. All rights reserved. Service names are shortened from CPT Consumer Friendly Descriptors (CMS data, 2018). CPT notice
See the full table · Guide: How to read Medicare Part B data
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Published CMS data list 1,496 Medicare Part D prescriptions, including refills, in 2018.
Source: CMS, Medicare Part D Prescribers – by Provider and Drug, 2018. Published rows only; this is not a quality measure.
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Published Part D records, 2018:
- Atorvastatin Calcium — 114 prescription fills, including refills.
- Lisinopril — 113 prescription fills, including refills.
- Losartan Potassium — 103 prescription fills, including refills.
Source: CMS, Medicare Part D Prescribers – by Provider and Drug, 2018. Drug names come from pharmacy claims. Listing a drug here is not an endorsement or a recommendation.
See all 42 records in the table · Guide: How to read Medicare Part D prescriber data
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Medicare Part B services went from 1,633 in 2017 to 144 in 2018.
Source: CMS, Medicare Physician & Other Practitioners – by Provider and Service, 2017–2018.
Practice Location & Contact Primary Location
637 Washington St
Brookline, MA 024464500
Matched by practice address or phone in NPPES. A shared address or phone does not confirm that this clinician works there.
What Public CMS Data Show
Internal Medicine: NPPES taxonomy is a reported classification, not proof of board certification.
Medicare patients
76 people with Original Medicare in 2018
It gives a sense of how many people with Medicare this clinician treated that year.
Source: CMS, Medicare Physician & Other Practitioners – by Provider, 2018.
Medicare-allowed amount
About $4,642 in 2018
The total amount Medicare approved for these services in 2018. 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 – by Provider and Service, 2018.
Paid by Medicare
About $4,642 in 2018
The part of the Medicare-allowed amount that Medicare itself paid in 2018, 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 – by Provider and Service, 2018.
30-day fills
3,848 standardized 30-day fills in 2018
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
$58,618 in 2018
The total cost of these prescriptions in 2018, 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 – by Provider and Drug, 2018.
Open Payments general payments, program year 2019
All general payments: $35.30 across 2 records.
By nature of payment
- Food and Beverage: $35.30 across 2 records.
Reporting-company totals
- BIODELIVERY SCIENCES INTERNATIONAL, INC.: $19.32 across 1 record.
- Bristol-Myers Squibb Company: $15.98 across 1 record.
A reported payment does not necessarily mean the financial relationship is improper and is not a measure of care quality. Clinicians can review and dispute these records.
Source: Calculated by T-MedInfo from CMS Open Payments general-payment records for program year 2019 (published June 30, 2026).
NPI first issued
2006
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.
Medicare assignment not listed
CMS data do not show whether this clinician accepts Medicare assignment. This does not mean they do not accept Medicare. Ask the office.
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, CMS release of October 2, 2026; Medicare.gov, “Does your provider accept Medicare as full payment?”
No telehealth indicator
CMS shows this indicator only when recent Medicare claims include telehealth services. The clinician may still offer telehealth; ask the office.
Source: CMS, Telehealth Indicator on Medicare Care Compare (fact sheet, January 2023); CMS Doctors and Clinicians, CMS release of October 2, 2026.
Compared with the same specialty in Brookline and Massachusetts
Billing and prescribing volume is not a quality rating.
Medicare Part B
Comparisons use 2024 data. The latest CMS data for Dr. Rees are from 2018.
Medicare Part D
Comparisons use 2024 data. The latest CMS data for Dr. Rees are from 2018.
57 active clinicians are listed under Internal Medicine with a practice address in Brookline, MA (6,822 in Massachusetts).
Addresses are self-reported to NPPES and may be out of date.
Telehealth indicator in Brookline
31.6% of these 57 clinicians have the CMS telehealth indicator.
45.6% of these 57 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 decreased 91% from 1,633 in 2017 to 144 in 2018.
- 2017: 1,633
- 2018: 144
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Medicare-allowed amount
Medicare-allowed amount decreased 96% from $123,252 in 2017 to $4,642 in 2018.
- 2017: $123,252
- 2018: $4,642
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Paid by Medicare
Paid by Medicare decreased 95% from $100,895 in 2017 to $4,642 in 2018.
- 2017: $100,895
- 2018: $4,642
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Medicare Part D prescriptions
Medicare Part D prescriptions decreased 72% from 5,330 in 2014 to 1,496 in 2018.
- 2014: 5,330
- 2015: 5,597
- 2016: 6,866
- 2017: 6,806
- 2018: 1,496
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30-day fills
30-day fills decreased 65% from 11,103 in 2014 to 3,848 in 2018.
- 2014: 11,103
- 2015: 11,520
- 2016: 14,701
- 2017: 14,950
- 2018: 3,848
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Part D drug cost
Part D drug cost decreased 81% from $301,910 in 2014 to $58,618 in 2018.
- 2014: $301,910
- 2015: $315,441
- 2016: $394,116
- 2017: $365,829
- 2018: $58,618
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Industry payments (Open Payments)
CMS data for industry payments (Open Payments) are available for 2019 only.
Sources: CMS Medicare Physician & Other Practitioners (2018), CMS Medicare Part D Prescribers (2018), CMS Open Payments (2019), CMS Doctors and Clinicians, CMS release of October 2, 2026, CMS NPPES NPI Registry. Specialty names follow the NUCC Health Care Provider Taxonomy.
Text: T-MedInfo · Report an error.
Pharma & Medical Device Financial Disclosures
Payments and other transfers of value that drug and medical device companies reported to CMS Open Payments
Program year 2019 (payments made January 1 – December 31, 2019): fewer than 11 records totaling $35.30.
| Manufacturer | Payment Nature | Product | Type | Amount ($) |
|---|---|---|---|---|
| BIODELIVERY SCIENCES INTERNATIONAL, INC. |
Food and Beverage
In-kind items and services
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BUNAVAIL 2.1 mg 30-count box | General | $19.32 |
| Bristol-Myers Squibb Company |
Food and Beverage
Cash or cash equivalent
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NULOJIX | General | $15.98 |
Source: CMS Open Payments, program year 2019, released June 30, 2026.
Performed Procedures & Service Volume
CPT® is a registered trademark of the American Medical Association. CPT codes, descriptions and other data only are copyright 2016–2017 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 – by Provider and Service data, 2017–2018; 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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G0008
Administration of influenza virus vaccine
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65 | 65 | $79.00 | $23.21 |
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90662
Influenza vaccine split virus, preservative free
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58 | 58 | $68.00 | $52.30 |
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85610
Blood test, clotting time
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21 | 13 | $24.00 | $4.75 |
Source: CMS Part B by Provider and Service, 2018; 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 2018.
| Brand Name | Generic Name | Prescriptions | Day Supply | Total Cost | Patients |
|---|---|---|---|---|---|
| Atorvastatin Calcium | Atorvastatin Calcium | 114 | 8,839 | $2,102.84 | 58 |
| Lisinopril | Lisinopril | 113 | 7,889 | $692.62 | 49 |
| Losartan Potassium | Losartan Potassium | 103 | 9,000 | $1,115.00 | 52 |
| Amlodipine Besylate | Amlodipine Besylate | 101 | 8,598 | $810.47 | 50 |
| Hydrochlorothiazide | Hydrochlorothiazide | 87 | 6,906 | $409.98 | 35 |
| Simvastatin | Simvastatin | 83 | 6,548 | $860.10 | 39 |
| Levothyroxine Sodium | Levothyroxine Sodium | 80 | 6,105 | $2,144.65 | 39 |
| Omeprazole | Omeprazole | 80 | 6,470 | $1,563.20 | 46 |
| Metoprolol Succinate | Metoprolol Succinate | 64 | 4,800 | $1,800.27 | 27 |
| Metformin Hcl | Metformin Hcl | 59 | 4,731 | $589.27 | 36 |
| Tamsulosin Hcl | Tamsulosin Hcl | 33 | 2,850 | $862.03 | 16 |
| Allopurinol | Allopurinol | 30 | 2,700 | $864.64 | 17 |
| Atenolol | Atenolol | 28 | 2,520 | $153.11 | 13 |
| Gabapentin | Gabapentin | 27 | 1,734 | $579.94 | 19 |
| Pradaxa | Dabigatran Etexilate Mesylate | 26 | 1,380 | $18,405.43 | — |
| Pravastatin Sodium | Pravastatin Sodium | 25 | 2,250 | $697.63 | 11 |
| Metoprolol Tartrate | Metoprolol Tartrate | 24 | 1,920 | $177.16 | 12 |
| Warfarin Sodium | Warfarin Sodium | 23 | 1,890 | $547.88 | — |
| Furosemide | Furosemide | 23 | 2,008 | $157.93 | 11 |
| Spironolactone | Spironolactone | 23 | 2,067 | $748.83 | 15 |
| Ranitidine Hcl | Ranitidine Hcl | 22 | 1,860 | $570.67 | 12 |
| Nadolol | Nadolol | 22 | 1,175 | $1,219.52 | — |
| Sertraline Hcl | Sertraline Hcl | 21 | 1,590 | $116.43 | — |
| Alendronate Sodium | Alendronate Sodium | 21 | 1,761 | $280.62 | — |
| Montelukast Sodium | Montelukast Sodium | 20 | 1,140 | $296.43 | — |
(top 25 shown)
Source: CMS Part D by Provider and Drug, 2018; 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.
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.)
Career & Practice History
NPI enumerated August 22, 2006.
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 November 2026.
NPI Administrative Meta
Other Internal Medicine Providers in Brookline
- Dr. William Goldberg, MD
- Dr. Christine Keegan, MD
- Dr. Debbie Shlain-Frink, MD
- Dr. Julia Ostrov, MD
- Dr. Jonathan Blumberg, MD
- Dr. Alla Tandetnik, MD
Mailing Address
637 Washington St
Brookline, MA 024464500
Phone: 6177541700