Erik Aron Holzwanger, M.D.
Gastroenterology (CMS) · Boston, MA
At a glance
800 Washington St, Boston, MA 02111-1552
Published activity: Colonoscopy · Upper gastrointestinal (GI) endoscopy for acid reflux. View counts and coverage
NPPES record updated Jan 5, 2026. Public records can lag behind changes at a practice.
Before you call: a quick checklist
- Are you accepting new patients?
- Do you accept my specific insurance plan?
- Do you provide the service I need at this address?
- Do I need a referral, and what is the earliest appointment?
Insurance participation and appointment availability are not established by these public records.
Medicare & insurance
Insurance participation is not established by these public records. Ask the practice and your insurer about your specific plan and this location.
How to check your coverage
Use your plan’s provider directory or the member-services number on your insurance card. Confirm the clinician, practice address, service, and whether a referral is required. A missing opt-out record does not establish Medicare acceptance.
Check the official Medicare directory ↗Practice location
800 Washington StBoston, MA 02111-1552
Additional reported practice locations
55 Lake Ave NWorcester, MA 016550002
Phone: 5083341000 736 Cambridge St
Brighton, MA 02135
Phone: 6175625432
Education & affiliations
- Medical / professional school
- Not reported in this file
- Graduation year
- 2014
- CMS specialties
- Gastroenterology
CMS reports telehealth services for this clinician. Confirm current services and availability with the practice.
Practice groups
- Bmc Affiliated Physicians, Inc.
- Integrated Gastroenterology Consultants, P.c.
- Physicians Of Cape Cod Hospital
- Pratt Medical Group Inc
Reported hospital affiliations
- Lowell General Hospital Lowell, MA
- Melrosewakefield Healthcare Melrose, MA
- Merrimack Health Lawrence Hospital Lawrence, MA
- South Shore Hospital South Weymouth, MA
- Tufts Medical Center Boston, MA
Graduation year does not establish years in practice. A reported affiliation does not establish employment, current admitting privileges, or insurance participation.
Source: CMS National Downloadable File · Published Oct 15, 2026.
Source: CMS Facility Affiliation Data · Published Oct 15, 2026.
Procedures in the public data
Reported activity can help you ask more informed questions about a practice’s services.
| Procedure category | Published Medicare activity |
|---|---|
| Colonoscopy | 74 |
| Upper gastrointestinal (GI) endoscopy for acid reflux | 377 |
CMS uses a one-year claims window with a reporting lag. Counts cover the Medicare activity included by CMS, not all patients. “1–10” is a published range. Volume is not a quality or outcomes score. Coverage and methodology
Source: CMS Utilization Data · Published Oct 15, 2026.
Find providers with a similar service mix
Compare 2024 published Medicare activity in the same reported specialty, here or in another city.
Industry-reported general payments
Includes reported transfers of value, such as meals, travel, or consulting. Payments do not establish improper conduct or quality of care. Research funding and ownership values are excluded from this total.
See payment purposes and reporting companies
Reported purposes
| Purpose | Amount |
|---|---|
| Consulting fee | $7,765.00 |
| Services other than consulting | $7,500.00 |
| Medical education speaking or faculty | $3,600.00 |
| Food and beverage | $696.12 |
| Travel and lodging | $36.96 |
Reporting companies
| Company | Amount |
|---|---|
| BOSTON SCIENTIFIC CORPORATION | $11,382.93 |
| OLYMPUS MEDICAL SYSTEMS CORPORATION | $4,301.96 |
| MICRO-TECH ENDOSCOPY USA, INC. | $3,600.00 |
| COOK MEDICAL LLC | $223.71 |
| CONMED CORPORATION | $89.48 |
Source: CMS 2025 payments grouped by covered recipient and nature of payments · Published Jun 30, 2026.
Professional details: NPI, taxonomy & registry record
Registry details
- Primary taxonomy
- Gastroenterology (CMS)
- Taxonomy code
- 207RG0100X
- Enumeration date
- Apr 14, 2015
- Record updated
- Jan 5, 2026
More registry details
- Provider type
- Individual · Type 1
- Reported credentials
- M.D.
Reported taxonomies and licenses
207RG0100X · Primary
License reported: 277398 MA
License numbers and credentials are reported to NPPES; HCPList does not independently verify them.
Practice location
800 Washington StBoston, MA 02111-1552
- Phone
- (617) 636-5000
Mailing address
65 HAMILTON AVEHAVERHILL, MA 018303313
Information may be outdated or incomplete. Confirm details directly with the practice. HCPList is an independent directory and is not affiliated with CMS.
Report a directory issue