Arsen Mastov, LCSW
NPI 1558664508 · Clinical Social Worker · Rego Park, NY
Enrolled with Medicare as Practitioner - Clinical Social Worker · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Arsen Mastov, LCSW is a Clinical Social Worker provider in Rego Park, NY (NPI 1558664508).
Provider details
- NPI number
- 1558664508
- Entity type
- Individual
- Primary specialty
- Clinical Social WorkerBehavioral Health & Social Service Providers
- Credential
- LCSW
- Sex
- Male
- Sole proprietor
- Yes
- License
- 082007 (NY)
Specialties & taxonomies
Behavioral Health & Social Service Providers
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
15 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
465 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, 45 Minutes90834 | 362 | $82 |
| Psychotherapy, 30 Minutes90832 | 103 | $61 |
Typical Medicare-allowed amounts for these services range $61–$82 (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.
Practice location
Mailing address
Registry dates
- Enumerated
- 2010-12-14
- Last updated
- 2025-12-28
- Certified
- 2025-12-28
Frequently asked questions
- What is Arsen Mastov's NPI number?
- Arsen Mastov's National Provider Identifier (NPI) is 1558664508, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Arsen Mastov's specialty?
- Arsen Mastov is listed in the NPPES registry with a primary specialty of Clinical Social Worker (Behavioral Health & Social Service Providers).
- Where is Arsen Mastov located?
- Arsen Mastov's practice location on file with NPPES is 9777 Queens Blvd Ph, Rego Park, NY 11374-3335.
- What is Arsen Mastov's phone number?
- The practice phone number listed in the NPPES registry for Arsen Mastov is (718) 896-9090.
- Does Arsen Mastov accept Medicare?
- Arsen Mastov is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Arsen Mastov's NPI active?
- Yes — Arsen Mastov's NPI (1558664508) is active in the NPPES registry as of the last update on 2025-12-28.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.