Robert Benjamin Diener, M.D.
NPI 1881884989 · Psychiatry Physician · Bridgewater, MA
Enrolled with Medicare as Practitioner - Psychiatry · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Robert Benjamin Diener, M.D. is a Psychiatry Physician provider in Bridgewater, MA (NPI 1881884989).
Provider details
- NPI number
- 1881884989
- Entity type
- Individual
- Primary specialty
- Psychiatry PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- 73381 (MA)
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
18 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
35 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 | 35 | $102 |
Typical Medicare-allowed amounts for these services range $102–$102 (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 · 31 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Benztropine Mesylate | 233 | 32 |
| Haloperidol | 160 | 18 |
| Olanzapine | 131 | 18 |
| Quetiapine Fumarate | 84 | — |
| Haloperidol Decanoate | 72 | — |
| Clozapine | 69 | — |
| Risperidone | 55 | — |
| Clonazepam | 46 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$13 across 1 record (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
- 2007-07-26
- Last updated
- 2007-07-26
Frequently asked questions
- What is Robert Benjamin Diener's NPI number?
- Robert Benjamin Diener's National Provider Identifier (NPI) is 1881884989, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Robert Benjamin Diener's specialty?
- Robert Benjamin Diener is listed in the NPPES registry with a primary specialty of Psychiatry Physician (Allopathic & Osteopathic Physicians).
- Where is Robert Benjamin Diener located?
- Robert Benjamin Diener's practice location on file with NPPES is Bridgewater State Hospital, Bridgewater, MA 02234.
- What is Robert Benjamin Diener's phone number?
- The practice phone number listed in the NPPES registry for Robert Benjamin Diener is (508) 279-4500.
- Does Robert Benjamin Diener accept Medicare?
- Robert Benjamin Diener is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Robert Benjamin Diener's NPI active?
- Yes — Robert Benjamin Diener's NPI (1881884989) is active in the NPPES registry as of the last update on 2007-07-26.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.