Diana Lau, MD
NPI 1770506537 · Rheumatology Physician · Woodland, CA
Enrolled with Medicare as Practitioner - Rheumatology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Diana Lau, MD is a Rheumatology Physician provider in Woodland, CA (NPI 1770506537).
Provider details
- NPI number
- 1770506537
- Entity type
- Individual
- Primary specialty
- Rheumatology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Female
- Sole proprietor
- No
- License
- G77103 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
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
1,170 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) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 873 | $140 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 143 | $100 |
| Injection of Drug Or Substance Under Skin Or Into Muscle96372 | 70 | $16 |
| New Patient Office Or Other Outpatient Visit With Moderate Level of Medical Decision Making, If Using Time, 45 Minutes Or More99204 | 67 | $179 |
| Administration of Influenza Virus VaccineG0008 | 17 | $34 |
Typical Medicare-allowed amounts for these services range $16–$179 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, and not what you would be billed. Medicare Part B covers roughly an eighth of all NPIs (65+ skew); services with fewer than 11 beneficiaries are suppressed by CMS. Source: CMS Medicare Physician & Other Practitioners, by Provider & Service.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 48 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Prednisone | 588 | 160 |
| Hydroxychloroquine Sulfate | 557 | 152 |
| Methotrexate Sodiumbrand: Methotrexate | 530 | 142 |
| Etanerceptbrand: Enbrel Sureclick | 237 | 25 |
| Adalimumabbrand: Humira(cf) Pen | 181 | 20 |
| Leflunomide | 136 | 42 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$1,282 across 12 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
- 2006-07-25
- Last updated
- 2008-05-07
Frequently asked questions
- What is Diana Lau's NPI number?
- Diana Lau's National Provider Identifier (NPI) is 1770506537, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Diana Lau's specialty?
- Diana Lau is listed in the NPPES registry with a primary specialty of Rheumatology Physician (Allopathic & Osteopathic Physicians).
- Where is Diana Lau located?
- Diana Lau's practice location on file with NPPES is 632 W Gibson Rd, Woodland, CA 95695.
- What is Diana Lau's phone number?
- The practice phone number listed in the NPPES registry for Diana Lau is (530) 666-1631.
- Does Diana Lau accept Medicare?
- Diana Lau is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Diana Lau's NPI active?
- Yes — Diana Lau's NPI (1770506537) is active in the NPPES registry as of the last update on 2008-05-07.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.