Dr. David M. Slack , MD
Internal Medicine โข Easthampton, MA
179 Northampton St, #h
Easthampton, MA 010271057
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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NPI assigned on March 23, 2006; this date does not establish years in practice.
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Published CMS data list 5,935 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:
- 36415 โ Insertion of needle into vein for collection of blood sample: 969 service units.
- 80061 โ Blood test, lipids (cholesterol and triglycerides): 465 service units.
- 80048 โ Blood test, basic group of blood chemicals (calcium, total): 454 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 57 records in the table ยท Guide: How to read Medicare Part B data
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Published CMS data list 4,558 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 297 prescription fills, including refills.
- Losartan Potassium โ 229 prescription fills, including refills.
- Amlodipine Besylate โ 216 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 102 records in the table ยท Guide: How to read Medicare Part D prescriber data
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More Medicare Part B services than 95% of 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 5,697 in 2020 to 5,935 in 2024.
Source: CMS, Medicare Physician & Other Practitioners โ by Provider and Service, 2020โ2024.
Practice Location & Contact Primary Location
179 Northampton St
#h
Easthampton, MA 010271057
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 1 group name: Valley Medical Group Pc. 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
New York Medical College
1985
What Public CMS Data Show
Internal Medicine: NPPES taxonomy is a reported classification, not proof of board certification.
Medicare patients
695 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 $181,536 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 $150,191 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
10,047 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
$355,920 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)
Fewer than 11 payment records totaling $21.28 in 2023
Drug and medical device companies must report certain payments to doctors and some other clinicians to CMS, such as meals, travel, speaking fees or research funding.
It shows reported financial ties between this clinician and companies. You can ask your clinician about them.
These records are submitted by drug and medical device companies, and a reported payment does not necessarily mean the financial relationship is improper.
General: payments not tied to research, such as meals, travel, consulting or speaking fees.
A reported payment does not necessarily mean the financial relationship is improper. Research payments can go to a hospital or university for a study the clinician leads, not to the clinician personally. Clinicians can dispute records with the company that reported them.
Source: CMS Open Payments, program year 2023.
Years since graduation
41 years (graduated 1985)
CMS Doctors and Clinicians data list 1985 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
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.
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. Slack 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. Slack 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 Easthampton and Massachusetts
Billing and prescribing volume is not a quality rating.
Medicare Part B services
More Medicare Part B services than 95% of clinicians listed under Internal Medicine in Massachusetts (2024, 3,795 clinicians with data). Median for this group: 524. Middle half: 200 to 1,073.
Too few clinicians listed under Internal Medicine in Easthampton have Medicare Part B data for 2024 to compare.
Medicare-allowed amount
A higher Medicare-allowed amount than 90% 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.
Too few clinicians listed under Internal Medicine in Easthampton have Medicare Part B data for 2024 to compare.
Paid by Medicare
A higher Medicare payment amount than 90% 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.
Too few clinicians listed under Internal Medicine in Easthampton have Medicare Part B data for 2024 to compare.
Medicare Part D prescriptions
More Part D prescriptions than 75% of 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.
Too few clinicians listed under Internal Medicine in Easthampton have Medicare Part D data for 2024 to compare.
Part D drug cost
A higher Part D drug cost than 75% of 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.
Too few clinicians listed under Internal Medicine in Easthampton have Medicare Part D data for 2024 to compare.
3 active clinicians are listed under Internal Medicine with a practice address in Easthampton, MA (6,830 in Massachusetts).
Addresses are self-reported to NPPES and may be out of date.
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 stayed about the same: 5,697 in 2020 and 5,935 in 2024.
- 2020: 5,697
- 2021: 5,385
- 2022: 4,990
- 2023: 5,382
- 2024: 5,935
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Medicare-allowed amount
Medicare-allowed amount decreased 18% from $221,997 in 2020 to $181,536 in 2024.
- 2020: $221,997
- 2021: $211,558
- 2022: $193,999
- 2023: $185,078
- 2024: $181,536
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Paid by Medicare
Paid by Medicare decreased 13% from $172,793 in 2020 to $150,191 in 2024.
- 2020: $172,793
- 2021: $165,788
- 2022: $155,437
- 2023: $151,837
- 2024: $150,191
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Medicare Part D prescriptions
Medicare Part D prescriptions stayed about the same: 4,768 in 2020 and 4,558 in 2024.
- 2020: 4,768
- 2021: 4,349
- 2022: 4,467
- 2023: 4,462
- 2024: 4,558
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30-day fills
30-day fills stayed about the same: 9,775 in 2020 and 10,047 in 2024.
- 2020: 9,775
- 2021: 9,115
- 2022: 9,534
- 2023: 9,798
- 2024: 10,047
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Part D drug cost
Part D drug cost increased 16% from $305,608 in 2020 to $355,920 in 2024.
- 2020: $305,608
- 2021: $328,971
- 2022: $405,562
- 2023: $428,164
- 2024: $355,920
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Industry payments (Open Payments)
CMS data for industry payments (Open Payments) are available for 2023 only.
Sources: CMS Medicare Physician & Other Practitioners (2024), CMS Medicare Part D Prescribers (2024), CMS Open Payments (2023), CMS Doctors and Clinicians, CMS NPPES NPI Registry. Specialty names follow the NUCC Health Care Provider Taxonomy.
Text: T-MedInfo ยท 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 2023 (payments made January 1 โ December 31, 2023): fewer than 11 records totaling $21.28.
| Manufacturer | Payment Nature | Product | Type | Amount ($) |
|---|---|---|---|---|
| Bristol Myers Squibb Company |
Food and Beverage
Cash or cash equivalent
|
ELIQUIS | General | $21.28 |
Source: CMS Open Payments, program year 2023, released June 30, 2026.
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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36415
Insertion of needle into vein for collection of blood sample
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969 | 463 | $20.00 | $8.61 |
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80061
Blood test, lipids (cholesterol and triglycerides)
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465 | 357 | $62.00 | $13.04 |
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80048
Blood test, basic group of blood chemicals (calcium, total)
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454 | 283 | $50.00 | $8.27 |
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99490
Chronic care management services, first 20 minutes of clinical staff time directed by health care professional, per calendar month
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397 | 183 | $75.00 | $63.20 |
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83036
Hemoglobin a1c level
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323 | 204 | $50.00 | $9.49 |
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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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308 | 184 | $313.69 | $128.82 |
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85025
Complete blood cell count (red cells, white blood cell, platelets), automated test and automated differential white blood cell count
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283 | 207 | $35.00 | $7.61 |
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80053
Blood test, comprehensive group of blood chemicals
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229 | 204 | $46.00 | $10.30 |
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83721
Ldl cholesterol level
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191 | 168 | $40.00 | $10.29 |
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84443
Blood test, thyroid stimulating hormone (tsh)
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143 | 122 | $71.00 | $16.36 |
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G0439
Annual wellness visit, includes a personalized prevention plan of service (pps), subsequent visit
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134 | 134 | $300.00 | $130.92 |
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99439
Chronic care management services for two or more chronic conditions, additional 20 minutes of clinical staff time directed by health care professional, per calendar month
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122 | 81 | $60.00 | $48.49 |
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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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104 | 93 | $224.13 | $90.99 |
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82043
Urine microalbumin (protein) level
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95 | 84 | $23.00 | $5.66 |
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82570
Creatinine level to test for kidney function or muscle injury
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95 | 84 | $27.00 | $5.08 |
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G0446
Annual, face-to-face intensive behavioral therapy for cardiovascular disease, individual, 15 minutes
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86 | 86 | $55.00 | $25.28 |
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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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84 | 76 | $35.00 | $16.42 |
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82306
Vitamin d-3 level
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83 | 71 | $127.00 | $29.01 |
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77063
Screening 3d breast mammography
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74 | 74 | $55.00 | $24.16 |
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77067
Screening mammography
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74 | 74 | $292.00 | $92.88 |
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82728
Ferritin (blood protein) level
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65 | 53 | $58.00 | $13.36 |
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80307
Testing for presence of drug, by chemistry analyzers
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62 | 34 | $192.00 | $60.90 |
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82607
Cyanocobalamin (vitamin b-12) level
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62 | 59 | $64.00 | $14.54 |
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83735
Magnesium level
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60 | 45 | $29.00 | $6.57 |
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83540
Iron level
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59 | 47 | $28.00 | $6.34 |
(top 25 shown)
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 | 297 | 25,776 | $4,447.15 | 86 |
| Losartan Potassium | Losartan Potassium | 229 | 20,021 | $2,960.98 | 73 |
| Amlodipine Besylate | Amlodipine Besylate | 216 | 17,876 | $1,556.63 | 62 |
| Lisinopril | Lisinopril | 197 | 17,122 | $1,627.29 | 60 |
| Oxycodone-Acetaminophen | Oxycodone Hcl/Acetaminophen | 185 | 4,736 | $5,198.57 | 24 |
| Oxycodone Hcl | Oxycodone Hcl | 184 | 4,791 | $5,018.20 | 30 |
| Clonazepam | Clonazepam | 148 | 5,203 | $1,001.46 | 23 |
| Levothyroxine Sodium | Levothyroxine Sodium | 131 | 11,632 | $1,295.31 | 34 |
| Tramadol Hcl | Tramadol Hcl | 101 | 2,133 | $509.45 | 32 |
| Omeprazole | Omeprazole | 100 | 8,766 | $1,386.71 | 33 |
| Metformin Hcl | Metformin Hcl | 97 | 7,790 | $1,032.29 | 25 |
| Albuterol Sulfate Hfa | Albuterol Sulfate | 89 | 2,405 | $2,399.53 | 21 |
| Pravastatin Sodium | Pravastatin Sodium | 76 | 5,826 | $1,945.82 | 22 |
| Chlorthalidone | Chlorthalidone | 73 | 5,048 | $1,647.30 | 19 |
| Lorazepam | Lorazepam | 73 | 1,981 | $322.12 | 19 |
| Metformin Hcl Er | Metformin Hcl | 73 | 6,114 | $1,003.29 | 19 |
| Metoprolol Succinate | Metoprolol Succinate | 72 | 6,376 | $2,958.72 | 20 |
| Eliquis | Apixaban | 68 | 4,252 | $79,211.15 | 16 |
| Hydrochlorothiazide | Hydrochlorothiazide | 66 | 5,940 | $257.26 | 20 |
| Fluticasone Propionate | Fluticasone Propionate | 60 | 3,183 | $716.92 | 16 |
| Furosemide | Furosemide | 60 | 4,831 | $438.69 | 20 |
| Pantoprazole Sodium | Pantoprazole Sodium | 55 | 4,660 | $1,084.91 | 16 |
| Cyclobenzaprine Hcl | Cyclobenzaprine Hcl | 54 | 1,254 | $361.81 | 15 |
| Trazodone Hcl | Trazodone Hcl | 54 | 3,802 | $1,017.43 | 22 |
| Gabapentin | Gabapentin | 50 | 3,840 | $1,661.58 | 19 |
(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.
NUCC Taxonomy Code: 208000000X
A pediatrician is concerned with the physical, emotional and social health of children from birth to young adulthood. Care encompasses a broad spectrum of health services ranging from preventive healthcare to the diagnosis and treatment of acute and chronic diseases. A pediatrician deals with biological, social and environmental influences on the developing child, and with the impact of disease and dysfunction on development.
Additional State Medicaid & Healthcare Payer Identifiers
Medicare (PECOS) Enrollment & Ordering Eligibility
Source: CMS PECOSPRACTITIONER - INTERNAL MEDICINE
I20050406000335
MA
9234186859
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
Valley Medical Group Pc
238 Northampton St, Easthampton, MA 010271046
Phone: 4135299300
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.)
Physician Assistant - Medical
Physician Assistant
Physician Assistant
Social Worker - Clinical
Master of Social Work, Licensed Independent Clinical Social Worker
Physician Assistant
Physician Assistant (Certified)
Family Medicine
Doctor of Medicine (M.D.)
Career & Practice History
NPI enumerated March 23, 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 August 2026.
NPI Administrative Meta
Other Internal Medicine Providers in Easthampton
Mailing Address
Po Box 8019
Springfield, MA 011028000
Phone: 8664314077