Margo Vassar, M.D.
NPI 1578784708 · Cardiovascular Disease Physician · Honolulu, HI
Enrolled with Medicare as Practitioner - Cardiovascular Disease (cardiology) · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Margo Vassar, M.D. is a Cardiovascular Disease Physician provider in Honolulu, HI (NPI 1578784708).
Provider details
- NPI number
- 1578784708
- Entity type
- Individual
- Primary specialty
- Cardiovascular Disease PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Female
- Sole proprietor
- No
- License
- MD-15863 (HI)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
19 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)25% of score
648 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
Medicare volume is ranked against active providers in the same specialty. 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 .
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Ultrasound of Heart With Color-Depicted Blood Flow, Rate, Direction and Valve Function93306 | 386 | $66 |
| Ultrasound of Heart With Color-Depicted Blood Flow, Rate and Valve Function93325 | 55 | $3 |
| Ultrasound of Heart Blood Flow, Valves and Chambers93320 | 34 | $17 |
| Initial Hospital Care With Moderate Level of Medical Decision Making, If Using Time, at Least 75 Minutes99223 | 34 | $169 |
| Ultrasound of Heart With Probe in Esophagus, With Report93312 | 32 | $100 |
| Ultrasound of Heart, Follow-Up93308 | 31 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$938 across 12 records (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Registry dates
- Enumerated
- 2007-05-02
- Last updated
- 2020-05-28
- Certified
- 2020-05-28
Frequently asked questions
- What is Margo Vassar's NPI number?
- Margo Vassar's National Provider Identifier (NPI) is 1578784708, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Margo Vassar's specialty?
- Margo Vassar is listed in the NPPES registry with a primary specialty of Cardiovascular Disease Physician (Allopathic & Osteopathic Physicians).
- Where is Margo Vassar located?
- Margo Vassar's practice location on file with NPPES is 550 S Beretania St Ste 601, Honolulu, HI 96813-2423.
- What is Margo Vassar's phone number?
- The practice phone number listed in the NPPES registry for Margo Vassar is (808) 691-8900.
- Does Margo Vassar accept Medicare?
- Margo Vassar is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Margo Vassar's NPI active?
- Yes — Margo Vassar's NPI (1578784708) is active in the NPPES registry as of the last update on 2020-05-28.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.