Dr. Matthew Drew Grunwald, MD
- Medicare services, 2024
- 598
- Medicare patients, 2024
- 232
- Part D claims, 2024
- 290
- Publications
- 4
- MIPS score, 2024
- 98
- Practice address
- 161 Marginal Way, 4th Floor, Portland, ME 04101
- Practice phone
- Call (207) 807-3732
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Endoscopy Center - Portland
Surgery Center - Medicare-Certified · Portland, Maine
Find Dr. Grunwald'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. Matthew Drew Grunwald is a gastroenterologist in Portland, Maine
Dr. Grunwald practices at Endoscopy Center - Portland in Portland, Maine.
Dr. Grunwald's NPI, 1689061954, was assigned on April 23, 2015. Dr. Grunwald holds Maine license MD25916.
- NPI
- 1689061954NPI Registry (opens in a new tab)
- Medicare PAC ID
- 5395080360
- NPI enumeration date
- April 23, 2015
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (207) 807-3732
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 37
- Medical school graduation
- 2015
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Matthew Drew Grunwald practices at Endoscopy Center - Portland in Portland, Maine
Dr. Grunwald's primary practice is Endoscopy Center - Portland, at 161 Marginal Way, 4th Floor, Portland, ME 04101. The practice phone is (207) 807-3732.
- Endoscopy Center - Portland161 Marginal Way, 4th Floor, Portland, ME 04101Phone(207) 807-3732
Source: Dmand AI Affiliation Data
Dr. Matthew Drew Grunwald is affiliated with 4 sites of care and 2 medical groups
Dr. Grunwald's primary practice is Endoscopy Center - Portland in Portland, Maine. Dr. Grunwald is also affiliated with MaineHealth Maine Medical Center. The medical group on file is MaineHealth Pediatric Cancer Care, Blood Disorders and IV Therapy (formerly Maine Children's Cancer Program). Dmand AI also links Dr. Grunwald to 1 more hospital, 1 group practice or clinic and 1 medical group, each named with a free account.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Matthew Drew Grunwald's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Grunwald practices, 4 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Endoscopy Center - Portland | Available with a free account |
| +3 more sites and 1 medical group | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Matthew Drew Grunwald is one of 83 gastroenterologists in Maine
Gastroenterology is Dr. Grunwald's primary specialty in the NPI Registry, under taxonomy code 207RG0100X. Dr. Grunwald is licensed in Maine.
Specialties and state licenses
- Gastroenterology, MainePrimary
Gastroenterologists near Dr. Grunwald
Counts of gastroenterologists 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. Matthew Drew Grunwald billed Medicare for 598 services in 2024
CMS data shows 598 Medicare services from Dr. Grunwald across 10 procedure codes in 2024, for 232 Medicare patients. Medicare paid $43,197 for them.
Dr. Grunwald's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Lab and pathology
- 2023: 2092024: 24618%
- Surgery
- 2023: 1972024: 2075%
- Other services
- 2023: 712024: 9230%
- Office and hospital visits
- 2023: 932024: 5343%
Where Dr. Grunwald's Medicare services took place, 2024
- In an office31252%
- In a facility28648%
Dr. Grunwald compared with the Maine median for gastroenterologists, 2024
- Dr. Grunwald
- Maine median
- Medicare services
- 598vs 2692.2 times
- Medicare patients
- 232vs 233Close to median
- Part D claims
- 162vs 22127% below
Medians across 90 gastroenterologists in Maine with Dmand AI profiles that report each measure.
Dr. Grunwald'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. Grunwald and other gastroenterologists in Maine.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Matthew Drew Grunwald treated 232 Medicare patients in 2024, average age 71
CMS counts 232 Medicare patients who saw Dr. Grunwald in 2024. The largest group is 65 to 74, with 110 patients. 65% of them have high cholesterol, and 55% have high blood pressure. 24% 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. Grunwald's median patient age at 59, with 51% women.
Dr. Grunwald's Medicare patients by age, 2024
Dr. Grunwald's Medicare patients by sex, 2024
- Women11248%
- Men12052%
Chronic conditions among Dr. Grunwald's Medicare patients, 2024
- High cholesterol65%
- High blood pressure55%
- Arthritis33%
- Anxiety26%
- Mood disorders26%
- Ischemic heart disease25%
- Depression22%
- Chronic kidney disease21%
Share of Medicare patients with each condition. A patient can have several.
Dr. Grunwald's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 59
Patient panel by sex, all payers
- Women51%
- Men48%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Matthew Drew Grunwald wrote 290 Medicare Part D claims in 2024
In 2024, Dr. Grunwald wrote 290 Medicare Part D claims for 132 patients. 81% of them were for generic drugs. CMS names the drug for 162 of them, across 6 drugs with 11 or more claims each, at $8,958 in total drug cost. In 2023, CMS named 150 claims across 4 drugs.
Dr. Grunwald's Part D claims by kind of drug, 2024
- Generic236 claims81%
- Brand-name54 claims19%
Dr. Grunwald'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. Grunwald's Part D claims, 2024
- Antibiotics6%18 of 290 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: 1502024: 1628%
Drugs named by CMS: 6 in 2024, 4 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. Matthew Drew Grunwald scored 98 out of 100 in Medicare's MIPS program for 2024
CMS publishes a Merit-based Incentive Payment System (MIPS) score of 98 out of 100 for Dr. Grunwald for performance year 2024, reported through an alternative payment model (APM). Dr. Grunwald accepts Medicare assignment, so Medicare's approved amount is taken as full payment. CMS counts 132 procedures of upper gastrointestinal (gi) endoscopy for acid reflux by Dr. Grunwald, more than 82% of the clinicians it reports for that procedure.
- Accepts Medicare assignment
- Yes
Dr. Grunwald's MIPS scores, performance year 2024
- 98of 100Final score
- 83.3of 100Quality
- 100of 100Promoting Interoperability
- 40of 100Improvement Activities
Each score is out of 100. The final score weighs the categories CMS scored for this clinician.
Where Dr. Grunwald ranks in Medicare procedure volume
- Upper gastrointestinal (GI) endoscopy for acid reflux
- 82nd percentile132 procedures
- Colonoscopy
- 72nd percentile74 procedures
CMS ranks each clinician against every clinician it reports for the same procedure category.
Sources: Doctors and Clinicians National Downloadable File (CMS); Clinician Public Reporting: Overall MIPS Performance (CMS), 2024 data, released September 10, 2026; and Doctors and Clinicians Utilization Data (CMS)
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Dr. Matthew Drew Grunwald has 4 publications on record
Dmand AI links 4 papers to Dr. Grunwald, published from 2021 to 2022. Dr. Grunwald's most frequent co-authors are Abhishek Agnihotri, MD, Venkata Sandeep Akshintala, MD and Juan Carlos C. Bucobo, MD.
Dr. Grunwald's most frequent co-authors
- Abhishek Agnihotri, MD1 shared paper
- Venkata Sandeep Akshintala, MD1 shared paper
- Juan Carlos C. Bucobo, MD1 shared paper
Recent publications by Dr. Grunwald
See who Dr. Grunwald researches with
Physician Network Discovery turns co-authorship, shared hospitals and shared groups into a map of who Dr. Grunwald works with, so you can find a warm path to the right gastroenterologists.
Sources: PubMed (National Library of Medicine); and Dmand AI Research Linkage
Dr. Matthew Drew Grunwald received $805 in industry payments from 2021 to 2025
CMS Open Payments shows 26 general payments to Dr. Grunwald from 13 drug and device companies from 2021 to 2025. Food and beverage make up the largest share, 100% of the total. FUJIFILM Healthcare Americas Corporation paid the most, $221.
General payments to Dr. Grunwald by program year, 2021 to 2025
Companies that paid Dr. Grunwald the most, 2021 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Sources for Dr. Matthew Drew Grunwald'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)Clinician Public Reporting: Overall MIPS Performance (CMS) (opens in a new tab)Doctors and Clinicians Utilization Data (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 |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| 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. Matthew Drew Grunwald
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. Matthew Drew Grunwald's NPI number?
Dr. Matthew Drew Grunwald's NPI number is 1689061954. It was assigned on April 23, 2015, and it is active in the NPI Registry.
What kind of doctor is Dr. Matthew Drew Grunwald?
Dr. Matthew Drew Grunwald is a gastroenterologist in Portland, Maine. The primary specialty in the NPI Registry is Gastroenterology Physician (taxonomy code 207RG0100X).
Where does Dr. Matthew Drew Grunwald practice?
Dr. Grunwald practices at 161 Marginal Way, 4th Floor, Portland, ME 04101. Dr. Grunwald's primary practice is Endoscopy Center - Portland in Portland, Maine. Dmand AI also links Dr. Grunwald to 1 hospital, 1 group practice or clinic and 1 medical group.
What is Dr. Matthew Drew Grunwald's office phone number?
The practice phone on file for Dr. Grunwald is (207) 807-3732.
What is Dr. Matthew Drew Grunwald's medical license number?
Dr. Grunwald holds Maine license MD25916.
Which hospitals is Dr. Matthew Drew Grunwald affiliated with?
Dr. Grunwald is affiliated with MaineHealth Maine Medical Center. Dmand AI links Dr. Grunwald to 1 more hospital.
What medical group is Dr. Matthew Drew Grunwald part of?
Dr. Grunwald is linked to MaineHealth Pediatric Cancer Care, Blood Disorders and IV Therapy (formerly Maine Children's Cancer Program). Dmand AI links Dr. Grunwald to 1 more medical group.
Does Dr. Matthew Drew Grunwald accept Medicare?
Yes. CMS data shows Dr. Grunwald billed Medicare for 598 services in 2024, and Dr. Grunwald accepts Medicare assignment.
What is Dr. Matthew Drew Grunwald's MIPS score?
Dr. Grunwald's MIPS final score for performance year 2024 is 98 out of 100, reported through an alternative payment model (APM).
How many Medicare patients does Dr. Matthew Drew Grunwald see?
CMS counts 232 Medicare patients who saw Dr. Grunwald in 2024, with an average age of 71.
Show 6 more questionsShow fewer questions
What services does Dr. Matthew Drew Grunwald bill to Medicare?
In 2024, Dr. Grunwald's most billed Medicare services were lab and pathology test (88305), medicare service (G0500) and surgery: digestive system (45385).
What drugs does Dr. Matthew Drew Grunwald prescribe most?
In 2024 Medicare Part D data, Dr. Grunwald's most prescribed drugs by claims were Omeprazole, Gavilyte-G and Carvedilol.
Has Dr. Matthew Drew Grunwald received payments from drug or device companies?
CMS Open Payments shows $805 in general payments to Dr. Grunwald from 13 companies from 2021 to 2025. The largest total came from FUJIFILM Healthcare Americas Corporation.
How long has Dr. Matthew Drew Grunwald been practicing?
Dr. Grunwald graduated from medical school in 2015, 11 years ago.
Does Dr. Matthew Drew Grunwald do research?
Dmand AI links 4 publications to Dr. Grunwald, published from 2021 to 2022.
Who does Dr. Matthew Drew Grunwald publish with?
Dr. Grunwald's most frequent co-authors are Abhishek Agnihotri, MD (1 shared paper), Venkata Sandeep Akshintala, MD (1 shared paper) and Juan Carlos C. Bucobo, MD (1 shared paper).
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