Quick answers
- Does Vanessa K. Mah accept Medicare assignment?
- Yes. Medicare's clinician data says Vanessa K. Mah accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of October 2, 2026. Ask the office to confirm before your visit.
- How many Medicare patients does Vanessa K. Mah see?
- In 2024, CMS data shows 25 Original Medicare patients and 84 services for Vanessa K. Mah. This counts Original Medicare only and measures volume, not quality.
- What is Vanessa K. Mah's NPI number?
- 1790566867. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Medicare activity in 2024
Official CMS public-use data for Vanessa K. Mah, data year 2024 (released May 21, 2026). It covers Original Medicare (fee-for-service) patients only, not Medicare Advantage or other insurance. It shows volume, not quality or outcomes. CMS hides any count of 10 or fewer patients.
| Original Medicare patients | 25 |
|---|---|
| Services billed to Medicare | 84 |
| Different services or procedures | 5 |
| Participating Medicare provider | Yes |
| Average age of these patients | 37 |
Most frequent services
- Ultrasound of heart for congenital defect (93303)16 services
- Ultrasound of heart blood flow, valves and chambers (93320)16 services
- Ultrasound of heart with color-depicted blood flow, rate and valve function (93325)16 services
Chronic conditions among these patients
Share of this clinician’s Original Medicare patients with each condition, as published by CMS (it describes the patients, not the care given).
- High blood pressure48%
Hospitals where Vanessa K. Mah works
Medicare's Facility Affiliation Data lists Vanessa K. Mah at these hospitals (updated October 2, 2026). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians. Star rating and emergency services: Hospital General Information (CMS), data updated October 26, 2026.
- Boston Children's HospitalBoston, MA · Children's Hospital · Emergency services: listed by Medicare · CCN 223302
Practice locations
Addresses where Vanessa K. Mah is enrolled with Medicare (CMS data updated October 2, 2026).
- 300 Longwood AveBoston, MA 02115 (617) 355‑6000
Group practices
Medicare enrollment lists Vanessa K. Mah as a member of this group (CMS data updated October 2, 2026).
- Boston Childrens Heart Foundation Inc100 clinicians in the group
Specialties
Find other Cardiovascular Disease (Cardiology) doctors in Massachusetts →
Other cardiologists in Boston
Clinicians with the same Medicare primary specialty in Boston, MA — not a recommendation.
Other clinicians in Boston Childrens Heart Foundation Inc
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Medical school | University Of Ottawa, Faculty Of Medicine |
|---|---|
| Graduation year | 2009 (17 years since medical school) |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1790566867 |
| Corrections | Report an error or suggest an update → |
Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.
Sources
- Facility Affiliation Data — Centers for Medicare & Medicaid Services (CMS), data updated October 2, 2026, retrieved October 29, 2026
- Hospital General Information — CMS, data updated October 26, 2026, retrieved November 13, 2026
- National Downloadable File (Doctors and Clinicians) — CMS, data updated October 2, 2026, retrieved October 29, 2026
- Medicare Physician & Other Practitioners - by Provider — CMS, data year 2024, released May 21, 2026; Medicare Physician & Other Practitioners - by Provider and Service
- NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
- Medicare Care Compare — official Medicare tool to look up clinicians