Michael Yap, M.D.
NPI 1588847362 · Nephrology Physician · Orange, CA
Enrolled with Medicare as Practitioner - Nephrology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Michael Yap, M.D. is a Nephrology Physician provider in Orange, CA (NPI 1588847362).
Provider details
- NPI number
- 1588847362
- Entity type
- Individual
- Primary specialty
- Nephrology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- Yes
- License
- A110518 (CA)
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
18 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
1,282 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) |
|---|---|---|
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 50 Minutes99233 | 655 | $122 |
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 35 Minutes99232 | 337 | $81 |
| Initial Hospital Care With Moderate Level of Medical Decision Making, If Using Time, at Least 75 Minutes99223 | 155 | $179 |
| Dialysis Services, 4 Or More Physician Visits Per Month (20 Years Or Older)90960 | 76 | $369 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 32 | $99 |
| Initial Hospital Care With Straightforward Or Low-Level Medical Decision Making, If Using Time, at Least 55 Minutes |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 12 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Nifedipinebrand: Nifedipine Er | 41 | 15 |
| Tolvaptan | 36 | 11 |
| Bumetanide | 33 | 14 |
| Valsartan | 29 | — |
| Ferric Citratebrand: Auryxia | 18 | — |
| Parenteral Amino Acid 20% No.1brand: Prosol | 18 | — |
| Furosemide | 17 | — |
| Amlodipine Besylate |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$102 across 5 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
- 2007-12-14
- Last updated
- 2023-09-04
- Certified
- 2023-09-04
Frequently asked questions
- What is Michael Yap's NPI number?
- Michael Yap's National Provider Identifier (NPI) is 1588847362, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Michael Yap's specialty?
- Michael Yap is listed in the NPPES registry with a primary specialty of Nephrology Physician (Allopathic & Osteopathic Physicians).
- Where is Michael Yap located?
- Michael Yap's practice location on file with NPPES is 500 S Main St Ste 101, Orange, CA 92868-4535.
- What is Michael Yap's phone number?
- The practice phone number listed in the NPPES registry for Michael Yap is (657) 231-2099.
- Does Michael Yap accept Medicare?
- Michael Yap is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Michael Yap's NPI active?
- Yes — Michael Yap's NPI (1588847362) is active in the NPPES registry as of the last update on 2023-09-04.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.