Dr. Nathaniel J. Merrell, MD
- Medicare services, 2024
- 281
- Medicare patients, 2024
- 226
- Part D claims, 2024
- 129
- Hospital affiliations
- 2
- Industry payments
- $32
- Practice address
- 60 Hospital Road, Leominster, MA 01453
- Practice phone
- Call (978) 466-2000
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Find Dr. Merrell's professional email, personal email and mobile number
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Dr. Nathaniel J. Merrell is a general surgeon in Leominster, Massachusetts
Dr. Merrell practices at UMass Memorial Health - HealthAlliance-Clinton Hospital in Leominster, Massachusetts, part of UMass Memorial Health Care.
Dr. Merrell's NPI, 1922162262, was assigned on December 21, 2006. Dr. Merrell graduated from University of Rochester School of Medicine and Dentistry in 1987. Dr. Merrell holds Massachusetts license 72557.
- NPI
- 1922162262NPI Registry (opens in a new tab)
- Medicare PAC ID
- 9537101084
- NPI enumeration date
- December 21, 2006
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (978) 466-2000
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 65
- Medical school graduation
- 1987
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Nathaniel J. Merrell practices at UMass Memorial Health - HealthAlliance-Clinton Hospital in Leominster, Massachusetts
Dr. Merrell's primary practice is UMass Memorial Health - HealthAlliance-Clinton Hospital, at 60 Hospital Road, Leominster, MA 01453 in Worcester County. The practice phone is (978) 466-2000.
- UMass Memorial Health - HealthAlliance-Clinton Hospital60 Hospital Road, Leominster, MA 01453 · Worcester CountyPhone(978) 466-2000
Source: Dmand AI Affiliation Data
Dr. Nathaniel J. Merrell is affiliated with 3 sites of care and 1 medical group
Dr. Merrell's primary practice is UMass Memorial Health - HealthAlliance-Clinton Hospital in Leominster, Massachusetts, part of UMass Memorial Health Care. Dr. Merrell is also affiliated with UMass Memorial Medical Center - University Campus. The medical group on file is Leslie Shelton MD. Dmand AI also links Dr. Merrell to 1 more group practice or clinic, named with a free account.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Nathaniel J. Merrell's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Merrell practices, 3 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| UMass Memorial Health - HealthAlliance-Clinton Hospital | Available with a free account |
| +2 more affiliated sites | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Nathaniel J. Merrell is one of 732 general surgeons in Massachusetts
Surgery is Dr. Merrell's primary specialty in the NPI Registry, under taxonomy code 208600000X. Dr. Merrell is licensed in Massachusetts.
Specialties and state licenses
- Surgery, MassachusettsPrimary
General surgeons near Dr. Merrell
Counts of general surgeons 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. Nathaniel J. Merrell billed Medicare for 281 services in 2024
CMS data shows 281 Medicare services from Dr. Merrell across 7 procedure codes in 2024, for 226 Medicare patients. Medicare paid $19,116 for them.
Dr. Merrell's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 3082024: 26215%
- Surgery
- 2023: 02024: 19
Where Dr. Merrell's Medicare services took place, 2024
- In an office20071%
- In a facility8129%
Dr. Merrell compared with the Massachusetts median for general surgeons, 2024
- Dr. Merrell
- Massachusetts median
- Medicare services
- 281vs 20041% above
- Medicare patients
- 226vs 15249% above
- Part D claims
- 103vs 224.7 times
Medians across 688 general surgeons in Massachusetts with Dmand AI profiles that report each measure.
Dr. Merrell'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. Merrell and other general surgeons in Massachusetts.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Nathaniel J. Merrell treated 226 Medicare patients in 2024, average age 73
CMS counts 226 Medicare patients who saw Dr. Merrell in 2024. The largest group is 65 to 74, with 101 patients. 75% of them have high cholesterol, and 72% have high blood pressure. 27% are also on Medicaid. Their average risk score is 1.64, where 1.00 is the Medicare average, so they are sicker than most Medicare patients.
Across all payers, Dmand AI patient panel data puts Dr. Merrell's median patient age at 62, with 58% women.
Dr. Merrell's Medicare patients by age, 2024
Dr. Merrell's Medicare patients by sex, 2024
- Women14363%
- Men8337%
Chronic conditions among Dr. Merrell's Medicare patients, 2024
- High cholesterol75%
- High blood pressure72%
- Arthritis45%
- Anxiety36%
- Mood disorders36%
- Cancer31%
- Depression31%
- Diabetes29%
Share of Medicare patients with each condition. A patient can have several.
Dr. Merrell's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 62
Patient panel by sex, all payers
- Women58%
- Men42%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Nathaniel J. Merrell wrote 129 Medicare Part D claims in 2024
In 2024, Dr. Merrell wrote 129 Medicare Part D claims for 83 patients. 97% of them were for generic drugs. CMS names the drug for 103 of them, across 3 drugs with 11 or more claims each, at $408 in total drug cost. In 2023, CMS named 102 claims across 4 drugs.
Dr. Merrell's Part D claims by kind of drug, 2024
- Generic125 claims97%
- Brand-name and other4 claims3%
Dr. Merrell'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. Merrell's Part D claims, 2024
- Opioids53%68 of 129 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: 1022024: 1031%
Drugs named by CMS: 3 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. Nathaniel J. Merrell ranks in the 94th percentile for hernia repair - groin (open) in Medicare
Dr. Merrell accepts Medicare assignment, so Medicare's approved amount is taken as full payment. CMS counts 15 procedures of hernia repair - groin (open) by Dr. Merrell, more than 94% of the clinicians it reports for that procedure.
- Accepts Medicare assignment
- Yes
Where Dr. Merrell ranks in Medicare procedure volume
- Hernia repair - groin (open)
- 94th percentile15 procedures
- Melanoma (skin cancer) excision
- 66th percentile12 procedures
CMS ranks each clinician against every clinician it reports for the same procedure category.
Colonoscopy: 1 to 10 procedures (CMS shows small counts as a range)
Mastectomy: 1 to 10 procedures (CMS shows small counts as a range)
Removal of nail tissue: 1 to 10 procedures (CMS shows small counts as a range)
Removal of tissue: 1 to 10 procedures (CMS shows small counts as a range)
Skin biopsy: 1 to 10 procedures (CMS shows small counts as a range)
Upper gastrointestinal (GI) endoscopy for acid reflux: 1 to 10 procedures (CMS shows small counts as a range)
Sources: Doctors and Clinicians National Downloadable File (CMS); and Doctors and Clinicians Utilization Data (CMS)
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Dr. Nathaniel J. Merrell received $32 in industry payments in 2017
CMS Open Payments shows 2 general payments to Dr. Merrell from 1 drug or device company in 2017. Food and beverage make up the largest share, 100% of the total. Olympus Corporation of the Americas paid the most, $32.
Companies that paid Dr. Merrell the most, 2017 to 2017
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Nathaniel J. Merrell graduated from University of Rochester School of Medicine and Dentistry
Dr. Merrell graduated from University of Rochester School of Medicine and Dentistry in 1987.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. Nathaniel J. Merrell'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)Doctors and Clinicians Utilization Data (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. Nathaniel J. Merrell
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. Nathaniel J. Merrell's NPI number?
Dr. Nathaniel J. Merrell's NPI number is 1922162262. It was assigned on December 21, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. Nathaniel J. Merrell?
Dr. Nathaniel J. Merrell is a general surgeon in Leominster, Massachusetts. The primary specialty in the NPI Registry is Surgery Physician (taxonomy code 208600000X).
Where does Dr. Nathaniel J. Merrell practice?
Dr. Merrell practices at 60 Hospital Road, Leominster, MA 01453. Dr. Merrell's primary practice is UMass Memorial Health - HealthAlliance-Clinton Hospital in Leominster, Massachusetts, part of UMass Memorial Health Care. Dmand AI also links Dr. Merrell to 1 group practice or clinic.
What is Dr. Nathaniel J. Merrell's office phone number?
The practice phone on file for Dr. Merrell is (978) 466-2000.
What is Dr. Nathaniel J. Merrell's medical license number?
Dr. Merrell holds Massachusetts license 72557.
Which hospitals is Dr. Nathaniel J. Merrell affiliated with?
Dr. Merrell practices at UMass Memorial Health - HealthAlliance-Clinton Hospital in Leominster, Massachusetts. Dr. Merrell is also affiliated with UMass Memorial Medical Center - University Campus.
What medical group is Dr. Nathaniel J. Merrell part of?
Dr. Merrell is linked to Leslie Shelton MD.
Does Dr. Nathaniel J. Merrell accept Medicare?
Yes. CMS data shows Dr. Merrell billed Medicare for 281 services in 2024, and Dr. Merrell accepts Medicare assignment.
How many Medicare patients does Dr. Nathaniel J. Merrell see?
CMS counts 226 Medicare patients who saw Dr. Merrell in 2024, with an average age of 73.
What services does Dr. Nathaniel J. Merrell bill to Medicare?
In 2024, Dr. Merrell's most billed Medicare services were office visit, established patient (99212), office visit, new patient (99203) and hospital inpatient care (99231).
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Where did Dr. Nathaniel J. Merrell go to medical school?
Dr. Merrell graduated from University of Rochester School of Medicine and Dentistry in 1987.
What drugs does Dr. Nathaniel J. Merrell prescribe most?
In 2024 Medicare Part D data, Dr. Merrell's most prescribed drugs by claims were Oxycodone-Acetaminophen, Ibuprofen and Hydrocortisone.
Has Dr. Nathaniel J. Merrell received payments from drug or device companies?
CMS Open Payments shows $32 in general payments to Dr. Merrell from 1 company from 2017 to 2017. The largest total came from Olympus Corporation of the Americas.
How long has Dr. Nathaniel J. Merrell been practicing?
Dr. Merrell graduated from medical school in 1987, 39 years ago.
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