Rainier Diaz, M.D.
NPI 1942256482 · Psychiatry Physician · Tucson, AZ
Enrolled with Medicare as Practitioner - Psychiatry · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Rainier Diaz, M.D. is a Psychiatry Physician provider in Tucson, AZ (NPI 1942256482).
Provider details
- NPI number
- 1942256482
- Entity type
- Individual
- Primary specialty
- Psychiatry PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- License
- 26841 (AZ)
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
20 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
553 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) |
|---|---|---|
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 35 Minutes99232 | 412 | $75 |
| Subsequent Hospital Care With Straightforward Or Low Level of Medical Decision Making, Per Day, If Using Time, at Least 25 Minutes99231 | 62 | $47 |
| Hospital Discharge Day Management, 30 Minutes Or Less99238 | 40 | $77 |
| Psychiatric Diagnostic Evaluation90791 | 22 | $144 |
| Initial Hospital Care With Straightforward Or Low Level of Medical Decision Making, Per Day, If Using Time, at Least 40 Minutes99221 | 17 | $79 |
Typical Medicare-allowed amounts for these services range $47–$144 (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 · 25 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Hydroxyzine Pamoate | 97 | 66 |
| Trazodone Hcl | 65 | 48 |
| Haloperidol | 46 | 26 |
| Duloxetine Hcl | 45 | 21 |
| Benztropine Mesylate | 44 | 39 |
| Venlafaxine Hclbrand: Venlafaxine Hcl Er | 42 | 14 |
| Quetiapine Fumarate | 39 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$170 across 9 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
- 2006-05-26
- Last updated
- 2007-07-08
Frequently asked questions
- What is Rainier Diaz's NPI number?
- Rainier Diaz's National Provider Identifier (NPI) is 1942256482, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Rainier Diaz's specialty?
- Rainier Diaz is listed in the NPPES registry with a primary specialty of Psychiatry Physician (Allopathic & Osteopathic Physicians).
- Where is Rainier Diaz located?
- Rainier Diaz's practice location on file with NPPES is 8050 E Lakeside Pkwy, Tucson, AZ 85730-1254.
- What is Rainier Diaz's phone number?
- The practice phone number listed in the NPPES registry for Rainier Diaz is (520) 584-5820.
- Does Rainier Diaz accept Medicare?
- Rainier Diaz is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Rainier Diaz's NPI active?
- Yes — Rainier Diaz's NPI (1942256482) is active in the NPPES registry as of the last update on 2007-07-08.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.