May Chien, MD
May Chien, MD is a Pediatric Hematology & Oncology Physician in Palo Alto, CA, registered under NPI 1417221326. This provider registers 4 separate taxonomy codes, which usually means they practise across more than one recognised specialty.
Getting there
The practice address on file is 1000 WELCH RD STE 300, Palo Alto, CA 94304. We have not yet mapped what surrounds this office — parking, transit, and nearby pharmacies are added as our data collection reaches each location.
Credentials and Medicare
| Licence | State | Specialty |
|---|---|---|
| A119918 | CA | Pediatric Hematology & Oncology Physician primary |
| A119918 | CA | Hematology (Internal Medicine) Physician |
| A119918 | CA | Pediatrics Physician |
| A119918 | CA | Internal Medicine Physician |
This provider holds licence A119918 issued in CA. A licence number in NPPES reflects what was filed at registration — it does not confirm the licence is still active today.
- Status
- Approved
- Provider type
- Practitioner - Internal Medicine
- PAC ID
- 6507085032
- Enrollment ID
- I20140916001710
Medicare enrolment is recorded as approved under the provider type Practitioner - Internal Medicine. Being enrolled means the provider can bill Medicare; it does not tell you whether they are currently accepting new Medicare patients. Call the office to confirm.
What Pediatric Hematology-Oncology covers
A pediatrician trained in the combination of pediatrics, hematology and oncology to recognize and manage pediatric blood disorders and cancerous diseases. NUCC Health Care Provider Taxonomy, code 2080P0207X
All registered taxonomy codes
This provider registers 4 taxonomy codes. The primary code is what appears on most claims; the others record additional recognised specialties.
| Code | Specialty | Licence | State | |
|---|---|---|---|---|
| 2080P0207X | Pediatric Hematology & Oncology Physician Pediatric Hematology-Oncology | A119918 | CA | primary |
| 207RH0000X | Hematology (Internal Medicine) Physician Hematology | A119918 | CA | |
| 208000000X | Pediatrics Physician | A119918 | CA | |
| 207R00000X | Internal Medicine Physician | A119918 | CA |
The taxonomy records how the provider classifies their own practice. It does not confirm which conditions they currently treat, whether they are accepting new patients, or which insurance they take — call the office for that.
Full NPPES record
An NPI-1 identifies a single person. It stays with the clinician for life, even if they move practice or change state, which is why the address on file can lag behind where they actually work today.
| NPI | 1417221326 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | Feb 24, 2012 |
| Last updated | Apr 18, 2024 |
| Status | Active |
| Sole proprietor | No |
| Credential | MD |
| Practice address |
1000 WELCH RD STE 300 Palo Alto, CA 94304 (650) 723-5535 |
| Mailing address |
725 WELCH RD Palo Alto, CA 94304 |
| Other identifiers |
113287
· Other (CA) |
Number check
How the check works, step by step
Every NPI carries a Luhn check digit — the same scheme used on credit cards. CMS prefixes the number with 80840 before computing it, which marks it as a US health identifier.
| Digit | 8 | 0 | 8 | 4 | 0 | 1 | 4 | 1 | 7 | 2 | 2 | 1 | 3 | 2 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 4 | 2 | 7 | 4 | 2 | 2 | 3 | 4 |
Sum = 54 · next multiple of 10 = 60 · check digit = 6 · actual last digit = 6
A valid check digit only means the number is well-formed. It does not mean the provider is licensed, active, or in good standing — those are separate questions answered by the sections above.