Nicholas Nissen, MD
NPI 1821624818 · Psychiatry Physician · Austin, TX
Enrolled with Medicare as Practitioner - Psychiatry · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Nicholas Nissen, MD is a Psychiatry Physician provider in Austin, TX (NPI 1821624818).
Provider details
- NPI number
- 1821624818
- Entity type
- Individual
- Primary specialty
- Psychiatry PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Student, Health Care
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
6 yrs in NPPES registry
- Profile completeness28% of score
83% of core fields populated
- Practice footprint17% of score
3 documented practice locations
- Medicare service volume (vs. specialty peers)28% of score
75 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) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 75 | $98 |
Typical Medicare-allowed amounts for these services range $98–$98 (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 · 12 distinct drugs on file.
| Drug | Part D claims (2024) |
|---|---|
| Clozapine | 38 |
| Paliperidone Palmitatebrand: Invega Sustenna | 37 |
| Olanzapine | 30 |
| Benztropine Mesylate | 24 |
| Haloperidol | 18 |
| Aripiprazole | 16 |
| Risperidone | 16 |
| Sertraline Hcl | 16 |
| Trazodone Hcl | 15 |
| Aripiprazolebrand: Abilify Maintena |
Practice location
Mailing address
Additional practice locations (2)
- 1493 Cambridge StCambridge, MA 02139-1047Phone: (617) 665-1000
- 2624 9th Ave SFargo, ND 58103-2350Phone: (701) 298-4500Fax: (701) 298-4600
Registry dates
- Enumerated
- 2020-03-21
- Last updated
- 2024-06-27
- Certified
- 2024-06-03
Frequently asked questions
- What is Nicholas Nissen's NPI number?
- Nicholas Nissen's National Provider Identifier (NPI) is 1821624818, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Nicholas Nissen's specialty?
- Nicholas Nissen is listed in the NPPES registry with a primary specialty of Psychiatry Physician (Allopathic & Osteopathic Physicians).
- Where is Nicholas Nissen located?
- Nicholas Nissen's practice location on file with NPPES is 3001 Bee Cave Rd Ste 220, Austin, TX 78746-5590.
- What is Nicholas Nissen's phone number?
- The practice phone number listed in the NPPES registry for Nicholas Nissen is (815) 354-8932.
- Does Nicholas Nissen accept Medicare?
- Nicholas Nissen is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Nicholas Nissen's NPI active?
- Yes — Nicholas Nissen's NPI (1821624818) is active in the NPPES registry as of the last update on 2024-06-27.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.