Mariko Shimizu
NPI 1750813861 · Psychiatry Physician · Cambridge, MA
Enrolled with Medicare as Practitioner - Psychiatry · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Mariko Shimizu is a Psychiatry Physician provider in Cambridge, MA (NPI 1750813861).
Provider details
- NPI number
- 1750813861
- Entity type
- Individual
- Primary specialty
- Psychiatry PhysicianAllopathic & Osteopathic Physicians
- Sex
- Female
- Sole proprietor
- No
- License
- MD-22378 (HI)
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 tenure28% of score
9 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
2 documented practice locations
- Medicare service volume (vs. specialty peers)28% of score
249 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) |
|---|---|---|
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 35 Minutes99232 | 181 | $82 |
| Psychiatric Diagnostic Evaluation With Medical Services90792 | 37 | $99 |
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 50 Minutes99233 | 31 | $124 |
Typical Medicare-allowed amounts for these services range $82–$124 (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 · 14 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Clonazepam | 48 | — |
| Trazodone Hcl | 45 | — |
| Sertraline Hcl | 37 | 15 |
| Citalopram Hydrobromidebrand: Citalopram Hbr | 28 | — |
| Aripiprazole | 27 | — |
| Quetiapine Fumarate | 25 | 11 |
| Lorazepam |
Practice location
Mailing address
Additional practice locations (1)
- 1301 Punchbowl StHonolulu, HI 96813-2499Phone: (808) 691-1000
Registry dates
- Enumerated
- 2017-03-28
- Last updated
- 2023-10-09
- Certified
- 2023-10-09
Frequently asked questions
- What is Mariko Shimizu's NPI number?
- Mariko Shimizu's National Provider Identifier (NPI) is 1750813861, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mariko Shimizu's specialty?
- Mariko Shimizu is listed in the NPPES registry with a primary specialty of Psychiatry Physician (Allopathic & Osteopathic Physicians).
- Where is Mariko Shimizu located?
- Mariko Shimizu's practice location on file with NPPES is 1493 Cambridge St, Cambridge, MA 02139-1099.
- What is Mariko Shimizu's phone number?
- The practice phone number listed in the NPPES registry for Mariko Shimizu is (617) 665-1000.
- Does Mariko Shimizu accept Medicare?
- Mariko Shimizu is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Mariko Shimizu's NPI active?
- Yes — Mariko Shimizu's NPI (1750813861) is active in the NPPES registry as of the last update on 2023-10-09.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.