Arnold Knepfer, M.D.
NPI 1134117435 · Psychiatry Physician · Corte Madera, CA
Enrolled with Medicare as Practitioner - Psychiatry · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Arnold Knepfer, M.D. is a Psychiatry Physician provider in Corte Madera, CA (NPI 1134117435).
Provider details
- NPI number
- 1134117435
- Entity type
- Individual
- Primary specialty
- Psychiatry PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- Yes
- License
- G5489 (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
20 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)28% of score
363 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, 1 Hour90838 | 120 | $129 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 120 | $146 |
| Subsequent Nursing Facility Care With High Level of Medical Decision Making, Per Day, If Using Time, at Least 45 Minutes99310 | 61 | $167 |
| Psychotherapy With Evaluation and Management Visit, 45 Minutes90836 | 31 | $97 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 31 | $104 |
Typical Medicare-allowed amounts for these services range $97–$167 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, 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 · 23 distinct drugs on file.
| Drug | Part D claims (2024) |
|---|---|
| Alprazolam | 56 |
| Quetiapine Fumarate | 43 |
| Zolpidem Tartrate | 40 |
| Lorazepam | 34 |
| Citalopram Hydrobromidebrand: Citalopram Hbr | 33 |
| Escitalopram Oxalate | 28 |
| Sertraline Hcl | 28 |
| Aripiprazole | 26 |
| Bupropion Hcl |
Practice location
Mailing address
Registry dates
- Enumerated
- 2005-10-11
- Last updated
- 2011-02-15
Frequently asked questions
- What is Arnold Knepfer's NPI number?
- Arnold Knepfer's National Provider Identifier (NPI) is 1134117435, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Arnold Knepfer's specialty?
- Arnold Knepfer is listed in the NPPES registry with a primary specialty of Psychiatry Physician (Allopathic & Osteopathic Physicians).
- Where is Arnold Knepfer located?
- Arnold Knepfer's practice location on file with NPPES is 21 Tamal Vista Blvd, Corte Madera, CA 94925-1130.
- What is Arnold Knepfer's phone number?
- The practice phone number listed in the NPPES registry for Arnold Knepfer is (415) 927-2320.
- Does Arnold Knepfer accept Medicare?
- Arnold Knepfer is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Arnold Knepfer's NPI active?
- Yes — Arnold Knepfer's NPI (1134117435) is active in the NPPES registry as of the last update on 2011-02-15.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.