Dr. Douglas R. Gronda, MD
- Medicare services, 2024
- 1,581
- Medicare patients, 2024
- 328
- Part D claims, 2024
- 7,902
- Hospital affiliations
- 5
- Industry payments
- $84
- Practice address
- 479 Washington St, Holliston, MA 01746
- Practice phone
- Call (508) 881-3029
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Charles River Medical Associates
Holliston, Massachusetts
Find Dr. Gronda'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. Douglas R. Gronda is an internist in Holliston, Massachusetts
Dr. Gronda practices at Charles River Medical Associates in Holliston, Massachusetts.
Dr. Gronda's NPI, 1962463109, was assigned on March 29, 2006. Dr. Gronda graduated from Boston University School of Medicine in 1999. Dr. Gronda holds Massachusetts license 214551.
- NPI
- 1962463109NPI Registry (opens in a new tab)
- Medicare PAC ID
- 1759412661
- NPI enumeration date
- March 29, 2006
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
- Practice phone
- (508) 881-3029
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 53
- Medical school graduation
- 1999
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Practice Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Douglas R. Gronda practices at Charles River Medical Associates in Holliston, Massachusetts
Dr. Gronda's primary practice is Charles River Medical Associates, at 479 Washington St, Holliston, MA 01746 in Middlesex County. The practice phone is (508) 881-3029.
- Charles River Medical Associates479 Washington St, Holliston, MA 01746 · Middlesex CountyPhone(508) 881-3029
Sources: NPPES NPI Registry (CMS); and Dmand AI Practice Data
Dr. Douglas R. Gronda is affiliated with 15 sites of care and 1 medical group
Dr. Gronda's primary practice is Charles River Medical Associates in Holliston, Massachusetts. Dr. Gronda is also affiliated with Brigham and Women's Hospital. The medical group on file is Charles River Medical Associates. Dmand AI also links Dr. Gronda to 4 more hospitals, 5 home health agencies, 2 hospices, 1 group practice or clinic and 1 skilled nursing facility, each named with a free account.
Sources: NPPES NPI Registry (CMS); Dmand AI Practice Data; and Dmand AI Affiliation Data
Dmand AI tracks the EHR system at Dr. Douglas R. Gronda's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Gronda practices, 14 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Charles River Medical Associates | Available with a free account |
| +14 more affiliated sites | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Douglas R. Gronda is one of 5,528 internists in Massachusetts
Internal medicine is Dr. Gronda's primary specialty in the NPI Registry, under taxonomy code 207R00000X. Dr. Gronda is licensed in Massachusetts.
Specialties and state licenses
- Internal medicine, MassachusettsPrimary
Internists near Dr. Gronda
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. Douglas R. Gronda billed Medicare for 1,581 services in 2024
CMS data shows 1,581 Medicare services from Dr. Gronda across 16 procedure codes in 2024, for 328 Medicare patients. Medicare paid $85,459 for them.
Dr. Gronda's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 5892024: 69117%
- Surgery
- 2023: 4682024: 4711%
- Other services
- 2023: 1182024: 252114%
- Tests and treatments
- 2023: 1312024: 16727%
Where Dr. Gronda's Medicare services took place, 2024
- In an office1,47793%
- In a facility1047%
Dr. Gronda compared with the Massachusetts median for internists, 2024
- Dr. Gronda
- Massachusetts median
- Medicare services
- 1,581vs 4313.7 times
- Medicare patients
- 328vs 19469% above
- Part D claims
- 7,120vs 40217.7 times
Medians across 5,369 internists in Massachusetts with Dmand AI profiles that report each measure.
Dr. Gronda'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. Gronda and other internists in Massachusetts.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Douglas R. Gronda treated 328 Medicare patients in 2024, average age 77
CMS counts 328 Medicare patients who saw Dr. Gronda in 2024. The largest group is 65 to 74, with 129 patients. 75% of them have high cholesterol, and 74% have high blood pressure. 16% are also on Medicaid. Their average risk score is 1.02, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Dr. Gronda's median patient age at 68, with 51% women.
Dr. Gronda's Medicare patients by age, 2024
Dr. Gronda's Medicare patients by sex, 2024
- Women17955%
- Men14945%
Chronic conditions among Dr. Gronda's Medicare patients, 2024
- High cholesterol75%
- High blood pressure74%
- Arthritis38%
- Anxiety25%
- Mood disorders25%
- Depression23%
- Diabetes23%
- Atrial fibrillation22%
Share of Medicare patients with each condition. A patient can have several.
Dr. Gronda's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 68
Patient panel by sex, all payers
- Women51%
- Men49%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Douglas R. Gronda wrote 7,902 Medicare Part D claims in 2024
In 2024, Dr. Gronda wrote 7,902 Medicare Part D claims for 606 patients. 89% of them were for generic drugs. CMS names the drug for 7,120 of them, across 123 drugs with 11 or more claims each, at $412,645 in total drug cost. In 2023, CMS named 6,230 claims across 115 drugs.
Dr. Gronda's Part D claims by kind of drug, 2024
- Generic7,005 claims89%
- Brand-name and other897 claims11%
Dr. Gronda'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. Gronda's Part D claims, 2024
- Opioids3%213 of 7,902 claims
- Antibiotics2%175 of 7,902 claims
- Antipsychotics, patients 65 and over2%152 of 7,902 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: 6,2302024: 7,12014%
Drugs named by CMS: 123 in 2024, 115 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. Douglas R. Gronda offers telehealth to Medicare patients
Dr. Gronda accepts Medicare assignment, so Medicare's approved amount is taken as full payment. CMS lists Dr. Gronda as offering telehealth.
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
Source: Doctors and Clinicians National Downloadable File (CMS)
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Dr. Douglas R. Gronda received $84 in industry payments from 2018 to 2023
CMS Open Payments shows 2 general payments to Dr. Gronda from 2 drug and device companies from 2018 to 2023. Education make up the largest share, 85% of the total. Teva Pharmaceuticals USA, Inc. paid the most, $71.
General payments to Dr. Gronda by program year, 2018 to 2023
General payments to Dr. Gronda by kind, 2018 to 2023
- Education$7185%
- Food and beverage$1315%
Companies that paid Dr. Gronda the most, 2018 to 2023
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Douglas R. Gronda graduated from Boston University School of Medicine
Dr. Gronda graduated from Boston University School of Medicine in 1999.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. Douglas R. Gronda'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 | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice Data |
| Primary practice, affiliations and health system | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice DataDmand AI Affiliation 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) |
| Industry payments | Open Payments (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. Douglas R. Gronda
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. Douglas R. Gronda's NPI number?
Dr. Douglas R. Gronda's NPI number is 1962463109. It was assigned on March 29, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. Douglas R. Gronda?
Dr. Douglas R. Gronda is an internist in Holliston, Massachusetts. The primary specialty in the NPI Registry is Internal Medicine Physician (taxonomy code 207R00000X).
Where does Dr. Douglas R. Gronda practice?
Dr. Gronda practices at 479 Washington St, Holliston, MA 01746. Dr. Gronda's primary practice is Charles River Medical Associates in Holliston, Massachusetts. Dmand AI also links Dr. Gronda to 4 hospitals, 5 home health agencies, 2 hospices, 1 group practice or clinic and 1 skilled nursing facility.
What is Dr. Douglas R. Gronda's office phone number?
The practice phone on file for Dr. Gronda is (508) 881-3029.
What is Dr. Douglas R. Gronda's medical license number?
Dr. Gronda holds Massachusetts license 214551.
Which hospitals is Dr. Douglas R. Gronda affiliated with?
Dr. Gronda is affiliated with Brigham and Women's Hospital. Dmand AI links Dr. Gronda to 4 more hospitals.
What medical group is Dr. Douglas R. Gronda part of?
Dr. Gronda is linked to Charles River Medical Associates.
Does Dr. Douglas R. Gronda accept Medicare?
Yes. CMS data shows Dr. Gronda billed Medicare for 1,581 services in 2024, and Dr. Gronda accepts Medicare assignment.
Does Dr. Douglas R. Gronda offer telehealth?
Yes. The CMS Doctors and Clinicians file lists Dr. Gronda as offering telehealth services.
How many Medicare patients does Dr. Douglas R. Gronda see?
CMS counts 328 Medicare patients who saw Dr. Gronda in 2024, with an average age of 77.
Show 5 more questionsShow fewer questions
What services does Dr. Douglas R. Gronda bill to Medicare?
In 2024, Dr. Gronda's most billed Medicare services were surgery: heart and blood vessels (36415), office visit, established patient (99214) and office visit, established patient (99213).
Where did Dr. Douglas R. Gronda go to medical school?
Dr. Gronda graduated from Boston University School of Medicine in 1999.
What drugs does Dr. Douglas R. Gronda prescribe most?
In 2024 Medicare Part D data, Dr. Gronda's most prescribed drugs by claims were Atorvastatin Calcium, Levothyroxine Sodium and Eliquis.
Has Dr. Douglas R. Gronda received payments from drug or device companies?
CMS Open Payments shows $84 in general payments to Dr. Gronda from 2 companies from 2018 to 2023. The largest total came from Teva Pharmaceuticals USA, Inc.
How long has Dr. Douglas R. Gronda been practicing?
Dr. Gronda graduated from medical school in 1999, 27 years ago.
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