Marissa Maas
NPI 1023644671 · Urology Physician · Los Angeles, CA
Enrolled with Medicare as Order and Referring Only - Urology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Marissa Maas is a Urology Physician provider in Los Angeles, CA (NPI 1023644671).
Provider details
- NPI number
- 1023644671
- Entity type
- Individual
- Primary specialty
- Urology PhysicianAllopathic & Osteopathic Physicians
- Sex
- Female
- 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 tenure33% of score
6 yrs in NPPES registry
- Profile completeness33% of score
83% of core fields populated
- Practice footprint20% of score
1 documented practice location
- Open Payments transparency13% of score
Has Open Payments disclosures (2024)
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 prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 8 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Tamsulosin Hcl | 57 | 29 |
| Mirabegronbrand: Myrbetriq | 35 | 16 |
| Sulfamethoxazole/Trimethoprimbrand: Sulfamethoxazole-Trimethoprim | 27 | 27 |
| Tolterodine Tartratebrand: Tolterodine Tartrate Er | 24 | 19 |
| Finasteride | 21 | 11 |
| Oxycodone Hcl | 20 | 20 |
| Gabapentin |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$725 across 6 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
- 2020-03-16
- Last updated
- 2022-03-24
- Certified
- 2022-03-24
Frequently asked questions
- What is Marissa Maas's NPI number?
- Marissa Maas's National Provider Identifier (NPI) is 1023644671, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Marissa Maas's specialty?
- Marissa Maas is listed in the NPPES registry with a primary specialty of Urology Physician (Allopathic & Osteopathic Physicians).
- Where is Marissa Maas located?
- Marissa Maas's practice location on file with NPPES is 1441 Eastlake Ave Ste 7416, Los Angeles, CA 90089-1020.
- What is Marissa Maas's phone number?
- The practice phone number listed in the NPPES registry for Marissa Maas is (323) 865-3700.
- Does Marissa Maas accept Medicare?
- Marissa Maas is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Marissa Maas's NPI active?
- Yes — Marissa Maas's NPI (1023644671) is active in the NPPES registry as of the last update on 2022-03-24.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.