Thaddeus Block, M.D.
NPI 1497897433 · Psychiatry Physician · Palo Alto, CA
Enrolled with Medicare as Practitioner - Psychiatry · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Thaddeus Block, M.D. is a Psychiatry Physician provider in Palo Alto, CA (NPI 1497897433).
Provider details
- NPI number
- 1497897433
- Entity type
- Individual
- Primary specialty
- Psychiatry PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- A76438 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
19 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
513 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) |
|---|---|---|
| Psychotherapy With Evaluation and Management Visit, 30 Minutes90833 | 221 | $82 |
| Established Patient Office Or Other Outpatient Visit With High Level of Medical Decision Making, If Using Time, 40 Minutes Or More99215 | 184 | $217 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 61 | $155 |
| 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 | 47 | $19 |
Typical Medicare-allowed amounts for these services range $19–$217 (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 · 9 distinct drugs on file.
| Drug | Part D claims (2024) |
|---|---|
| Aripiprazole | 22 |
| Trazodone Hcl | 20 |
| Desvenlafaxine Succinatebrand: Desvenlafaxine Succinate Er | 20 |
| Sertraline Hcl | 19 |
| Lamotrigine | 18 |
| Bupropion Hclbrand: Bupropion Xl | 15 |
| Gabapentin | 14 |
| Quetiapine Fumarate | 13 |
| Clonazepam |
Practice location
Mailing address
Additional practice locations (1)
- 401 Quarry RdPalo Alto, CA 94304-1419Phone: (650) 724-3262
Registry dates
- Enumerated
- 2007-02-13
- Last updated
- 2024-04-29
- Certified
- 2024-04-29
Frequently asked questions
- What is Thaddeus Block's NPI number?
- Thaddeus Block's National Provider Identifier (NPI) is 1497897433, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Thaddeus Block's specialty?
- Thaddeus Block is listed in the NPPES registry with a primary specialty of Psychiatry Physician (Allopathic & Osteopathic Physicians).
- Where is Thaddeus Block located?
- Thaddeus Block's practice location on file with NPPES is 300 Pasteur Dr, Palo Alto, CA 94304-2203.
- What is Thaddeus Block's phone number?
- The practice phone number listed in the NPPES registry for Thaddeus Block is (650) 723-4000.
- Does Thaddeus Block accept Medicare?
- Thaddeus Block is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Thaddeus Block's NPI active?
- Yes — Thaddeus Block's NPI (1497897433) is active in the NPPES registry as of the last update on 2024-04-29.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.