Regina Siu, APRN
NPI 1770366072 · Psychiatric/Mental Health Nurse Practitioner · Wayland, MA
Enrolled with Medicare as Practitioner - Nurse Practitioner · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Regina Siu, APRN is a Psychiatric/Mental Health Nurse Practitioner provider in Wayland, MA (NPI 1770366072).
Provider details
- NPI number
- 1770366072
- Entity type
- Individual
- Primary specialty
- Psychiatric/Mental Health Nurse PractitionerPhysician Assistants & Advanced Practice Nursing Providers
- Credential
- APRN
- Sex
- Female
- Sole proprietor
- No
- License
- RN2347564 (MA)
Specialties & taxonomies
Physician Assistants & Advanced Practice Nursing Providers
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
2 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)28% of score
255 Medicare services, 2024 (ranked within specialty)
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 methodology.
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 | 216 | $97 |
| Psychiatric Diagnostic Evaluation With Medical Services90792 | 39 | $163 |
Typical Medicare-allowed amounts for these services range $97–$163 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, not a price quote 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 · 50 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Lamotrigine | 178 | 27 |
| Risperidone | 120 | 13 |
| Clozapine | 113 | 12 |
| Clonazepam | 111 | 20 |
| Lorazepam | 95 | 19 |
| Benztropine Mesylate | 94 | 18 |
| Buspirone Hcl | 92 | 15 |
| Clonidine Hcl | 85 | 19 |
Practice location
Mailing address
Registry dates
- Enumerated
- 2023-08-18
- Last updated
- 2025-03-12
- Certified
- 2025-03-12
Frequently asked questions
- What is Regina Siu's NPI number?
- Regina Siu's National Provider Identifier (NPI) is 1770366072, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Regina Siu's specialty?
- Regina Siu is listed in the NPPES registry with a primary specialty of Psychiatric/Mental Health Nurse Practitioner (Physician Assistants & Advanced Practice Nursing Providers).
- Where is Regina Siu located?
- Regina Siu's practice location on file with NPPES is 260 Boston Post Rd Ste 10, Wayland, MA 01778-1888.
- What is Regina Siu's phone number?
- The practice phone number listed in the NPPES registry for Regina Siu is (978) 219-4040.
- Does Regina Siu accept Medicare?
- Regina Siu is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Regina Siu's NPI active?
- Yes — Regina Siu's NPI (1770366072) is active in the NPPES registry as of the last update on 2025-03-12.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.