Mayumi Oka, MD
NPI 1417902388 · Diagnostic Radiology Physician · Merrillville, IN
Enrolled with Medicare as Practitioner - Diagnostic Radiology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Mayumi Oka, MD is a Diagnostic Radiology Physician provider in Merrillville, IN (NPI 1417902388).
Provider details
- NPI number
- 1417902388
- Entity type
- Individual
- Primary specialty
- Diagnostic Radiology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Female
- Sole proprietor
- No
- License
- 01060110 (IN)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
20 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)28% of score
296 Medicare services, 2024 (ranked within specialty)
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 methodology.
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) |
|---|---|---|
| Ct Scan Head Or Brain Without Contrast70450 | 119 | $37 |
| Ct Scan of Upper Spine Without Contrast72125 | 32 | $44 |
| Mri Scan of Brain Before and After Contrast70553 | 26 | $100 |
| Mri Scan of Brain Without Contrast70551 | 24 | $65 |
| Ct Scan of Blood Vessels of Neck With Contrast70498 | 22 | $75 |
| X-Ray of Chest, 1 View71045 | 16 | $8 |
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-05-22
- Last updated
- 2008-01-09
Frequently asked questions
- What is Mayumi Oka's NPI number?
- Mayumi Oka's National Provider Identifier (NPI) is 1417902388, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mayumi Oka's specialty?
- Mayumi Oka is listed in the NPPES registry with a primary specialty of Diagnostic Radiology Physician (Allopathic & Osteopathic Physicians).
- Where is Mayumi Oka located?
- Mayumi Oka's practice location on file with NPPES is 8701 Broadway, Merrillville, IN 46410-7035.
- What is Mayumi Oka's phone number?
- The practice phone number listed in the NPPES registry for Mayumi Oka is (219) 738-5565.
- Does Mayumi Oka accept Medicare?
- Mayumi Oka is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Mayumi Oka's NPI active?
- Yes — Mayumi Oka's NPI (1417902388) is active in the NPPES registry as of the last update on 2008-01-09.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.