RICHARD MERMELSTEIN MD
NPI 1629488440
Internal Medicine in W Hempstead, NY
About Richard Mermelstein Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
RICHARD MERMELSTEIN MD (NPI 1629488440) is an individual internal medicine provider in W Hempstead, New York, licensed in New York (290500) and active in the NPI registry since May 2014. He is enrolled in Medicare PECOS, maintains a secondary practice location in Manhasset Hills, and is a graduate of Other (2014).
NPPES Registry Identity
Specialties & Licenses
Secondary Practice Location 1
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
Richard Mermelstein 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 Reassignment
Medicare enrollment records show Richard Mermelstein reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.
Manhasset, NY 11030
- Reassigned Medicare billing, New York enrollment
- 104 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 8
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.
Physician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 11552 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Medicare Quality Performance CMS QPP · MIPS
Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.
Other Providers at the Same Location NPPES 2
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
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 Richard Mermelstein's NPI number?
The NPI number for Richard Mermelstein is 1629488440. It was assigned to this individual provider in the NPPES registry on May 1, 2014.
Where is Richard Mermelstein located?
Richard Mermelstein practices at 225 Nassau Blvd # B, W Hempstead, NY 11552. The listed phone number is (516) 656-1919.
What is Richard Mermelstein's specialty?
The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.
Is Richard Mermelstein enrolled in Medicare?
Yes. Richard Mermelstein 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 organization bills Medicare for Richard Mermelstein's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Richard Mermelstein reassigns Medicare benefits to Prine Health Medical Group, PLLC (Manhasset, NY). The 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 Richard Mermelstein's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
When was this NPI record last updated?
The NPPES record for Richard Mermelstein was last updated on September 10, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 13 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.
# Richard Mermelstein, MD · NPI 1629488440
Internal Medicine physician in W Hempstead, New York. Individual provider, active in the CMS NPPES registry since May 1, 2014.
## Identity
- **NPI:** 1629488440 (Entity type: Individual)
- **Enumerated:** May 1, 2014
- **Primary specialty:** Internal Medicine · taxonomy 207R00000X
- **State license:** 290500 (New York)
- **Sole proprietor:** No
## Practice location
- **Address:** 225 NASSAU BLVD # B, W Hempstead, NY 11552-2247
- **Phone:** (516) 656-1919 · **Fax:** (833) 968-3330
## 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:** Prine Health Medical Group, PLLC (NPI 1144790163, Manhasset, NY), under Medicare reassignment (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2014
## Record status
- **NPPES last updated:** September 10, 2025
---
Source: [NPI Profile](https://npiprofile.com/npi/1629488440) · Data from the CMS NPPES public registry.