Dr. Erik Aron Holzwanger, MD
- Medicare services, 2024
- 732
- Medicare patients, 2024
- 298
- Part D claims, 2024
- 324
- Hospital affiliations
- 5
- Industry payments
- $92,294
- Practice address
- 295 Varnum Avenue, Lowell, MA 01854
- Practice phone
- Call (978) 937-6000
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Find Dr. Holzwanger'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. Erik Aron Holzwanger is a gastroenterologist in Lowell, Massachusetts
Dr. Holzwanger practices at Lowell General Hospital in Lowell, Massachusetts, part of Tufts Medicine.
Dr. Holzwanger's NPI, 1457747776, was assigned on April 14, 2015. Dr. Holzwanger holds Massachusetts license 277398.
- NPI
- 1457747776NPI Registry (opens in a new tab)
- Medicare PAC ID
- 2769790906
- NPI enumeration date
- April 14, 2015
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
- Practice phone
- (978) 937-6000
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 38
- Medical school graduation
- 2014
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Erik Aron Holzwanger practices at Lowell General Hospital in Lowell, Massachusetts
Dr. Holzwanger's primary practice is Lowell General Hospital, at 295 Varnum Avenue, Lowell, MA 01854 in Middlesex County. The practice phone is (978) 937-6000.
- Lowell General Hospital295 Varnum Avenue, Lowell, MA 01854 · Middlesex CountyPhone(978) 937-6000
Source: Dmand AI Affiliation Data
Dr. Erik Aron Holzwanger is affiliated with 6 sites of care and 5 medical groups
Dr. Holzwanger's primary practice is Lowell General Hospital in Lowell, Massachusetts, part of Tufts Medicine. Dr. Holzwanger is also affiliated with Tufts Medical Center. The medical group on file is Pratt Medical Group, Inc. - General Medical Associates (General Internal Medicine). Dmand AI also links Dr. Holzwanger to 3 more hospitals, 4 medical groups and 1 group practice or clinic, 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. Erik Aron Holzwanger's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Holzwanger practices, 6 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Lowell General Hospital | Available with a free account |
| +5 more sites and 4 medical groups | Available with a free account |
Source: Dmand AI Technology Install Data
For health IT teams
Dmand AI maps EHR vendors, IT decision makers and buying committees across Tufts Medicine and 6.2K+ hospitals, with verified contacts in the same login.
Dr. Erik Aron Holzwanger is one of 597 gastroenterologists in Massachusetts
Gastroenterology is Dr. Holzwanger's primary specialty in the NPI Registry, under taxonomy code 207RG0100X. Dr. Holzwanger is licensed in Massachusetts.
Specialties and state licenses
- Gastroenterology, MassachusettsPrimary
Gastroenterologists near Dr. Holzwanger
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. Erik Aron Holzwanger billed Medicare for 732 services in 2024
CMS data shows 732 Medicare services from Dr. Holzwanger across 24 procedure codes in 2024, for 298 Medicare patients. Medicare paid $85,052 for them.
Dr. Holzwanger's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Surgery
- 2023: 632024: 357467%
- Office and hospital visits
- 2023: 732024: 308322%
- Imaging
- 2023: 152024: 40167%
- Other services
- 2023: 02024: 27
Where Dr. Holzwanger's Medicare services took place, 2024
- In an office284%
- In a facility70496%
Dr. Holzwanger compared with the Massachusetts median for gastroenterologists, 2024
- Dr. Holzwanger
- Massachusetts median
- Medicare services
- 732vs 51941% above
- Medicare patients
- 298vs 34313% below
- Part D claims
- 288vs 300Close to median
Medians across 583 gastroenterologists in Massachusetts with Dmand AI profiles that report each measure.
Dr. Holzwanger'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.
Need commercial claims for Dr. Holzwanger?
Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Holzwanger and other gastroenterologists in Massachusetts.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Erik Aron Holzwanger treated 298 Medicare patients in 2024, average age 73
CMS counts 298 Medicare patients who saw Dr. Holzwanger in 2024. The largest group is 65 to 74, with 137 patients. 75% of them have high blood pressure, and 75% have high cholesterol. 34% are also on Medicaid. Their average risk score is 1.78, 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. Holzwanger's median patient age at 62, with 54% women.
Dr. Holzwanger's Medicare patients by age, 2024
Dr. Holzwanger's Medicare patients by sex, 2024
- Women15151%
- Men14749%
Chronic conditions among Dr. Holzwanger's Medicare patients, 2024
- High blood pressure75%
- High cholesterol75%
- Arthritis45%
- Anxiety40%
- Ischemic heart disease38%
- Chronic kidney disease37%
- Mood disorders37%
- Diabetes34%
Share of Medicare patients with each condition. A patient can have several.
Dr. Holzwanger'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
- Women54%
- Men45%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Erik Aron Holzwanger wrote 324 Medicare Part D claims in 2024
In 2024, Dr. Holzwanger wrote 324 Medicare Part D claims for 170 patients. 83% of them were for generic drugs. CMS names the drug for 288 of them, across 10 drugs with 11 or more claims each, at $25,156 in total drug cost. In 2023, CMS named 133 claims across 3 drugs.
Dr. Holzwanger's Part D claims by kind of drug, 2024
- Generic270 claims83%
- Brand-name54 claims17%
Dr. Holzwanger'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. Holzwanger's Part D claims, 2024
- Antibiotics5%17 of 324 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: 1332024: 288117%
Drugs named by CMS: 10 in 2024, 3 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. Erik Aron Holzwanger ranks in the 97th percentile for upper gastrointestinal (gi) endoscopy for acid reflux in Medicare
Dr. Holzwanger accepts Medicare assignment, so Medicare's approved amount is taken as full payment. CMS lists Dr. Holzwanger as offering telehealth. CMS counts 377 procedures of upper gastrointestinal (gi) endoscopy for acid reflux by Dr. Holzwanger, more than 97% of the clinicians it reports for that procedure.
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
Where Dr. Holzwanger ranks in Medicare procedure volume
- Upper gastrointestinal (GI) endoscopy for acid reflux
- 97th percentile377 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); and Doctors and Clinicians Utilization Data (CMS)
For MedTech and pharma teams
Filter 7.4M+ HCPs by Medicare procedures, Part D drugs and Open Payments history, then reach them with verified contacts in one login.
Dr. Erik Aron Holzwanger received $92,294 in industry payments from 2019 to 2025
CMS Open Payments shows 91 general payments to Dr. Holzwanger from 11 drug and device companies from 2019 to 2025. Grants make up the largest share, 54% of the total. Boston Scientific Corporation paid the most, $79,266.
General payments to Dr. Holzwanger by program year, 2019 to 2025
General payments to Dr. Holzwanger by kind, 2019 to 2025
- Grants$50,00054%
- Speaker and faculty fees$17,45019%
- Consulting fees$17,11519%
- Food and beverage$3,6794%
- Other$3,9514%
Companies that paid Dr. Holzwanger the most, 2019 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Sources for Dr. Erik Aron Holzwanger'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) |
| 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. Erik Aron Holzwanger
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. Erik Aron Holzwanger's NPI number?
Dr. Erik Aron Holzwanger's NPI number is 1457747776. It was assigned on April 14, 2015, and it is active in the NPI Registry.
What kind of doctor is Dr. Erik Aron Holzwanger?
Dr. Erik Aron Holzwanger is a gastroenterologist in Lowell, Massachusetts. The primary specialty in the NPI Registry is Gastroenterology Physician (taxonomy code 207RG0100X).
Where does Dr. Erik Aron Holzwanger practice?
Dr. Holzwanger practices at 295 Varnum Avenue, Lowell, MA 01854. Dr. Holzwanger's primary practice is Lowell General Hospital in Lowell, Massachusetts, part of Tufts Medicine. Dmand AI also links Dr. Holzwanger to 3 hospitals, 4 medical groups and 1 group practice or clinic.
What is Dr. Erik Aron Holzwanger's office phone number?
The practice phone on file for Dr. Holzwanger is (978) 937-6000.
What is Dr. Erik Aron Holzwanger's medical license number?
Dr. Holzwanger holds Massachusetts license 277398.
Which hospitals is Dr. Erik Aron Holzwanger affiliated with?
Dr. Holzwanger practices at Lowell General Hospital in Lowell, Massachusetts. Dr. Holzwanger is also affiliated with Tufts Medical Center. Dmand AI links Dr. Holzwanger to 3 more hospitals.
What medical group is Dr. Erik Aron Holzwanger part of?
Dr. Holzwanger is linked to Pratt Medical Group, Inc. - General Medical Associates (General Internal Medicine). Dmand AI links Dr. Holzwanger to 4 more medical groups.
Does Dr. Erik Aron Holzwanger accept Medicare?
Yes. CMS data shows Dr. Holzwanger billed Medicare for 732 services in 2024, and Dr. Holzwanger accepts Medicare assignment.
Does Dr. Erik Aron Holzwanger offer telehealth?
Yes. The CMS Doctors and Clinicians file lists Dr. Holzwanger as offering telehealth services.
How many Medicare patients does Dr. Erik Aron Holzwanger see?
CMS counts 298 Medicare patients who saw Dr. Holzwanger in 2024, with an average age of 73.
Show 4 more questionsShow fewer questions
What services does Dr. Erik Aron Holzwanger bill to Medicare?
In 2024, Dr. Holzwanger's most billed Medicare services were hospital inpatient care (99233), office visit, established patient (99214) and surgery: digestive system (43239).
What drugs does Dr. Erik Aron Holzwanger prescribe most?
In 2024 Medicare Part D data, Dr. Holzwanger's most prescribed drugs by claims were Gavilyte-G, Omeprazole and Gavilyte-C.
Has Dr. Erik Aron Holzwanger received payments from drug or device companies?
CMS Open Payments shows $92,294 in general payments to Dr. Holzwanger from 11 companies from 2019 to 2025. The largest total came from Boston Scientific Corporation.
How long has Dr. Erik Aron Holzwanger been practicing?
Dr. Holzwanger graduated from medical school in 2014, 12 years ago.
Selling to gastroenterology practices?
See gastroenterologists in Massachusetts by site of care and group
Find the practices, groups and hospitals they work with, and the right people to contact at each.
- 30 days free
- Self-serve
- No credit card