FREDERICK JOSEPH AST MD
NPI 1699742288
Internal Medicine - Rheumatology in New York, NY
About Frederick Joseph Ast Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
FREDERICK JOSEPH AST MD (NPI 1699742288) is an individual rheumatology provider in New York, New York, licensed in New York (1783111) and active in the NPI registry since March 2006. He is enrolled in Medicare PECOS, is affiliated with Opelousas General Health System, and maintains a secondary practice location in Long Beach.
NPPES Registry Identity
Specialties & Licenses 3
Other Names 1
Secondary Practice Location 1
Group Practice 1
Accepted Insurance
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare and accepts Medicare assignment
Frederick Joseph Ast Md is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.
Medicare Billing Reassignments
9Medicare enrollment records show Frederick Ast reassigns Medicare billing to 9 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
New York, NY 10016
- Reassigned Medicare billing, New York enrollment
- 346 clinicians in this Medicare group
Bronx, NY 10452
- Reassigned Medicare billing, New York enrollment
- 272 clinicians in this Medicare group
Bronx, NY 10453
- Reassigned Medicare billing, New York enrollment
- 1,393 clinicians in this Medicare group
Flint, MI 48507
- Reassigned Medicare billing, Michigan enrollment
- 246 clinicians in this Medicare group
Litchfield, MI 49252
- Reassigned Medicare billing, Michigan enrollment
- 174 clinicians in this Medicare group
Springfield, MO 65807
- Reassigned Medicare billing, New York enrollment
Opelousas, LA 70570
- Reassigned Medicare billing, Louisiana enrollment
- Medicare enrollment name: Opelousas General Health System Physician Practices
- 82 clinicians in this Medicare group
Benson, AZ 85602
- Reassigned Medicare billing, Arizona enrollment
- 152 clinicians in this Medicare group
Clarkston, WA 99403
- Reassigned Medicare billing, Washington enrollment
- Also billed through NPI 1598814352 (Washington)
- 144 clinicians in this Medicare group
Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
Areas of Expertise CMS Part B claims 6
Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.
Hospital Affiliations CMS Care Compare 5
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Opelousas General Health System
Acute Care Hospitals · Opelousas, LANorthern Light Eastern Maine Medical Center
Acute Care Hospitals · Bangor, MEPromedica Coldwater Regional Hospital
Acute Care Hospitals · Coldwater, MICox Medical Centers
Acute Care Hospitals · Springfield, MOTri-State Memorial Hospital
Critical Access Hospitals · Clarkston, WAPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 10016 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Frequently Asked Questions NPPES & CMS
Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.
What is Frederick Ast's NPI number?
The NPI number for Frederick Ast is 1699742288. It was assigned to this individual provider in the NPPES registry on March 2, 2006. The provider is also known as Fred Ast.
Where is Frederick Ast located?
Frederick Ast practices at 35 E 30th St Ste 1A, New York, NY 10016. The listed phone number is (212) 725-7027.
What is Frederick Ast's specialty?
The primary specialty registered for this NPI is Internal Medicine, specializing in Rheumatology, with taxonomy code 207RR0500X.
Is Frederick Ast enrolled in Medicare?
Yes. Frederick Ast is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.
Which organizations bill Medicare for Frederick Ast's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Frederick Ast reassigns Medicare benefits to 9 organizations: Icahn School Of Medicine At Mount Sinai (New York, NY), Shakespeare Operating LLC (Bronx, NY), Essen Medical Associates, PC (Bronx, NY), Jawad A Shah, MD PC (Flint, MI), Community Health Center Of Branch County (Litchfield, MI) and 4 more organizations, listed in the Medicare section above. Each reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Frederick Ast's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Frederick Ast accept?
Health plans from Ambetter Health, Ambetter from Arkansas Health & Wellness, Ambetter from Louisiana Healthcare Connections, Ambetter from Superior HealthPlan and Cigna HealthCare of Arizona, Inc and 4 other insurers list Frederick Ast as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.
Is Frederick Ast affiliated with any hospitals?
According to CMS data, Frederick Ast is affiliated with Opelousas General Health System, Northern Light Eastern Maine Medical Center, Promedica Coldwater Regional Hospital, Cox Medical Centers and Tri-State Memorial Hospital.
When was this NPI record last updated?
The NPPES record for Frederick Ast was last updated on July 29, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 2 months ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.
# Frederick Joseph Ast, MD · NPI 1699742288
Rheumatology physician in New York, New York. Individual provider, active in the CMS NPPES registry since March 2, 2006.
## Identity
- **NPI:** 1699742288 (Entity type: Individual)
- **Enumerated:** March 2, 2006
- **Primary specialty:** Internal Medicine - Rheumatology · taxonomy 207RR0500X
- **State license:** 1783111 (New York)
- **Sole proprietor:** Yes
## Practice location
- **Address:** 35 E 30TH ST, STE 1A, New York, NY 10016-7325
- **Phone:** (212) 725-7027 · **Fax:** (212) 725-0433
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** 9 organizations under Medicare reassignment (form CMS-855R): Icahn School Of Medicine At Mount Sinai (NPI 1669841466, New York, NY); Shakespeare Operating LLC (NPI 1720634538, Bronx, NY); Essen Medical Associates, PC (NPI 1366418709, Bronx, NY); Jawad A Shah, MD PC (NPI 1942402391, Flint, MI); Community Health Center Of Branch County (NPI 1518338359, Litchfield, MI); and 4 more · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 1987
## Record status
- **NPPES last updated:** July 29, 2026
---
Source: [NPI Profile](https://npiprofile.com/npi/1699742288) · Data from the CMS NPPES public registry.