Gerald Marx, MD
NPI 1063403384 · Pediatric Cardiology Physician · Boston, MA
Enrolled with Medicare as Practitioner - Cardiovascular Disease (cardiology) · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Gerald Marx, MD is a Pediatric Cardiology Physician provider in Boston, MA (NPI 1063403384).
Provider details
- NPI number
- 1063403384
- Entity type
- Individual
- Primary specialty
- Pediatric Cardiology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- 60399 (MA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
20 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
2 documented practice locations
Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
Practice location
Mailing address
Additional practice locations (1)
- 333 N Santa RosaSan Antonio, TX 78207-3108Phone: (210) 704-3030
Registry dates
- Enumerated
- 2005-11-04
- Last updated
- 2025-12-01
- Certified
- 2025-12-01
Frequently asked questions
- What is Gerald Marx's NPI number?
- Gerald Marx's National Provider Identifier (NPI) is 1063403384, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Gerald Marx's specialty?
- Gerald Marx is listed in the NPPES registry with a primary specialty of Pediatric Cardiology Physician (Allopathic & Osteopathic Physicians).
- Where is Gerald Marx located?
- Gerald Marx's practice location on file with NPPES is 300 Longwood Ave, Boston, MA 02115-5724.
- What is Gerald Marx's phone number?
- The practice phone number listed in the NPPES registry for Gerald Marx is (617) 355-0039.
- Does Gerald Marx accept Medicare?
- Gerald Marx is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Gerald Marx's NPI active?
- Yes — Gerald Marx's NPI (1063403384) is active in the NPPES registry as of the last update on 2025-12-01.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.