May Chen, MD
NPI 1881772887 · Nephrology Physician · Mission Viejo, CA
Enrolled with Medicare as Practitioner - Nephrology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
May Chen, MD is a Nephrology Physician provider in Mission Viejo, CA (NPI 1881772887).
Provider details
- NPI number
- 1881772887
- Entity type
- Individual
- Primary specialty
- Nephrology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Female
- Sole proprietor
- No
- License
- G78591 (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
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
1,477 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 35 Minutes99232 | 383 | $81 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 246 | $138 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 142 | $98 |
| Dialysis Services, 4 Or More Physician Visits Per Month (20 Years Or Older)90960 | 127 | $369 |
| Dialysis Services, 2-3 Physician Visits Per Month (20 Years Or Older)90961 | 111 | $305 |
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 50 Minutes99233 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 37 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Amlodipine Besylate | 95 | 36 |
| Losartan Potassium | 93 | 30 |
| Hydralazine Hcl | 76 | 21 |
| Furosemide | 68 | 26 |
| Metoprolol Succinate | 58 | 18 |
| Atorvastatin Calcium | 57 | 15 |
| Sevelamer Carbonate | 57 | 14 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$981 across 42 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
- 2006-11-01
- Last updated
- 2013-01-23
Frequently asked questions
- What is May Chen's NPI number?
- May Chen's National Provider Identifier (NPI) is 1881772887, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is May Chen's specialty?
- May Chen is listed in the NPPES registry with a primary specialty of Nephrology Physician (Allopathic & Osteopathic Physicians).
- Where is May Chen located?
- May Chen's practice location on file with NPPES is 26800 Crown Valley Pkwy, Mission Viejo, CA 92691-6384.
- What is May Chen's phone number?
- The practice phone number listed in the NPPES registry for May Chen is (949) 364-0644.
- Does May Chen accept Medicare?
- May Chen is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is May Chen's NPI active?
- Yes — May Chen's NPI (1881772887) is active in the NPPES registry as of the last update on 2013-01-23.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.