Walailuk Chaiyarat, MD
NPI 1811140478 · Hematology & Oncology Physician · Concord, CA
Enrolled with Medicare as Practitioner - Hematology/Oncology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Walailuk Chaiyarat, MD is a Hematology & Oncology Physician provider in Concord, CA (NPI 1811140478).
Provider details
- NPI number
- 1811140478
- Entity type
- Individual
- Primary specialty
- Hematology & Oncology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Female
- Sole proprietor
- Yes
- License
- A117301 (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
17 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
3 documented practice locations
- Medicare service volume (vs. specialty peers)25% of score
3,389 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 | 738 | $138 |
| Established Patient Office Or Other Outpatient Visit With High Level of Medical Decision Making, If Using Time, 40 Minutes Or More99215 | 327 | $192 |
| Injection of Drug Or Substance Under Skin Or Into Muscle96372 | 325 | $17 |
| Injection of Additional New Drug Or Substance Into Vein96375 | 236 | $19 |
| Visit Complexity Inherent to Evaluation and Management Associated With Medical Care Services That Serve As the Continuing Focal Point for All Needed Health Care Services And/Or With Medical Care Services That Are Part of Ongoing Care Related to a Patient'SG2211 | 231 | $18 |
| Infusion Into a Vein for Hydration, Each Additional Hour |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 35 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Apixabanbrand: Eliquis | 99 | 37 |
| Levothyroxine Sodium | 94 | 30 |
| Gabapentin | 94 | 37 |
| Pantoprazole Sodium | 90 | 38 |
| Mirtazapine | 90 | 45 |
| Letrozole | 88 | 28 |
| Potassium Chloride | 67 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$2,500 across 106 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
Additional practice locations (2)
- 100 Hospital Dr Ste 110bVallejo, CA 94589-2577Phone: (707) 551-3300
- 3000 Oak Rd # 311Walnut Creek, CA 94597-2092Phone: (925) 674-2100
Registry dates
- Enumerated
- 2008-10-28
- Last updated
- 2019-06-11
Frequently asked questions
- What is Walailuk Chaiyarat's NPI number?
- Walailuk Chaiyarat's National Provider Identifier (NPI) is 1811140478, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Walailuk Chaiyarat's specialty?
- Walailuk Chaiyarat is listed in the NPPES registry with a primary specialty of Hematology & Oncology Physician (Allopathic & Osteopathic Physicians).
- Where is Walailuk Chaiyarat located?
- Walailuk Chaiyarat's practice location on file with NPPES is 2571 Park Ave, Concord, CA 94520-1901.
- What is Walailuk Chaiyarat's phone number?
- The practice phone number listed in the NPPES registry for Walailuk Chaiyarat is (925) 674-2100.
- Does Walailuk Chaiyarat accept Medicare?
- Walailuk Chaiyarat is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Walailuk Chaiyarat's NPI active?
- Yes — Walailuk Chaiyarat's NPI (1811140478) is active in the NPPES registry as of the last update on 2019-06-11.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.