John Mardiat, M.D.
NPI 1801896675 · Diagnostic Radiology Physician · Santa Barbara, CA
Enrolled with Medicare as Practitioner - Diagnostic Radiology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
John Mardiat, M.D. is a Diagnostic Radiology Physician provider in Santa Barbara, CA (NPI 1801896675).
Provider details
- NPI number
- 1801896675
- Entity type
- Individual
- Primary specialty
- Diagnostic Radiology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- G44393 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
20 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
106 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) |
|---|---|---|
| Ultrasonic Guidance for Blood Vessel Access76937 | 32 | $13 |
| Insertion of Non-Tunneled Central Venous Tube for Infusion (5 Years Or Older)36556 | 23 | $79 |
| Aspiration of Fluid From Chest Cavity Using Imaging Guidance32555 | 22 | $103 |
| Insertion of Tunneled Central Venous Tube for Infusion (5 Years Or Older)36558 | 16 | $230 |
| Fluoroscopic Guidance for Insertion Or Removal of Central Vein Access Device77001 | 13 | $16 |
Typical Medicare-allowed amounts for these services range $13–$230 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, not a price quote and not what you would be billed. Medicare Part B covers roughly an eighth of all NPIs (65+ skew); services with fewer than 11 beneficiaries are suppressed by CMS. Source: CMS Medicare Physician & Other Practitioners, by Provider & Service.
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$1,806 across 10 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
- 2005-07-22
- Last updated
- 2012-01-25
Frequently asked questions
- What is John Mardiat's NPI number?
- John Mardiat's National Provider Identifier (NPI) is 1801896675, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is John Mardiat's specialty?
- John Mardiat is listed in the NPPES registry with a primary specialty of Diagnostic Radiology Physician (Allopathic & Osteopathic Physicians).
- Where is John Mardiat located?
- John Mardiat's practice location on file with NPPES is 316 W Junipero St, Santa Barbara, CA 93105-4305.
- What is John Mardiat's phone number?
- The practice phone number listed in the NPPES registry for John Mardiat is (805) 448-5825.
- Does John Mardiat accept Medicare?
- John Mardiat is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is John Mardiat's NPI active?
- Yes — John Mardiat's NPI (1801896675) is active in the NPPES registry as of the last update on 2012-01-25.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.