Lay Owyong, MD
NPI 1871667477 · Hematology & Oncology Physician · Stockton, CA
Enrolled with Medicare as Practitioner - Hematology/Oncology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Lay Owyong, MD is a Hematology & Oncology Physician provider in Stockton, CA (NPI 1871667477).
Provider details
- NPI number
- 1871667477
- Entity type
- Individual
- Primary specialty
- Hematology & Oncology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Female
- Sole proprietor
- No
- License
- A54077 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
19 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
1 documented practice location
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 prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 20 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Anastrozole | 168 | 67 |
| Ondansetron Hcl | 93 | 43 |
| Hydrocodone/Acetaminophenbrand: Hydrocodone-Acetaminophen | 66 | 21 |
| Gabapentin | 38 | 15 |
| Letrozole | 36 | 18 |
| Tamoxifen Citrate | 30 | 12 |
| Lorazepam | 27 | 11 |
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-11-17
- Last updated
- 2021-12-13
Frequently asked questions
- What is Lay Owyong's NPI number?
- Lay Owyong's National Provider Identifier (NPI) is 1871667477, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Lay Owyong's specialty?
- Lay Owyong is listed in the NPPES registry with a primary specialty of Hematology & Oncology Physician (Allopathic & Osteopathic Physicians).
- Where is Lay Owyong located?
- Lay Owyong's practice location on file with NPPES is 7373 West Ln, Stockton, CA 95210-3377.
- What is Lay Owyong's phone number?
- The practice phone number listed in the NPPES registry for Lay Owyong is (209) 476-2000.
- Does Lay Owyong accept Medicare?
- Lay Owyong is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Lay Owyong's NPI active?
- Yes — Lay Owyong's NPI (1871667477) is active in the NPPES registry as of the last update on 2021-12-13.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.