Kiefer Greenspan
NPI 1629573464 · Psychiatry Physician · Irvine, CA
Enrolled with Medicare as Practitioner - Psychiatry · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Kiefer Greenspan is a Psychiatry Physician provider in Irvine, CA (NPI 1629573464).
Provider details
- NPI number
- 1629573464
- Entity type
- Individual
- Primary specialty
- Psychiatry PhysicianAllopathic & Osteopathic Physicians
- Sex
- Male
- Sole proprietor
- No
- License
- A176625 (CA)
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
8 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
2,720 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) |
|---|---|---|
| Prolonged Office Or Other Outpatient Evaluation and Management Service(s) Beyond the Maximum Required Time of the Primary Procedure Which Has Been Selected Using Total Time on the Date of the Primary Service; Each Additional 15 Minutes By the Physician OrG2212 | 962 | $34 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 848 | $139 |
| Established Patient Office Or Other Outpatient Visit With High Level of Medical Decision Making, If Using Time, 40 Minutes Or More99215 | 357 | $189 |
| Psychotherapy With Evaluation and Management Visit, 30 Minutes90833 | 304 | $75 |
| Psychotherapy With Evaluation and Management Visit, 45 Minutes90836 | 180 | $95 |
| Psychiatric Services Complicated By Communication Factor |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 34 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Trazodone Hcl | 97 | 28 |
| Bupropion Hclbrand: Bupropion Xl | 96 | 19 |
| Escitalopram Oxalate | 89 | 22 |
| Sertraline Hcl | 82 | 15 |
| Quetiapine Fumarate | 69 | 14 |
| Gabapentin | 61 | 16 |
| Aripiprazole |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$4,708 across 204 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
- 2018-03-26
- Last updated
- 2025-06-16
- Certified
- 2025-06-16
Frequently asked questions
- What is Kiefer Greenspan's NPI number?
- Kiefer Greenspan's National Provider Identifier (NPI) is 1629573464, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Kiefer Greenspan's specialty?
- Kiefer Greenspan is listed in the NPPES registry with a primary specialty of Psychiatry Physician (Allopathic & Osteopathic Physicians).
- Where is Kiefer Greenspan located?
- Kiefer Greenspan's practice location on file with NPPES is 2646 Dupont Drive Suite 60, Irvine, CA 92612.
- What is Kiefer Greenspan's phone number?
- The practice phone number listed in the NPPES registry for Kiefer Greenspan is (949) 230-3543.
- Does Kiefer Greenspan accept Medicare?
- Kiefer Greenspan is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Kiefer Greenspan's NPI active?
- Yes — Kiefer Greenspan's NPI (1629573464) is active in the NPPES registry as of the last update on 2025-06-16.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.