MS. RUTH G DIAZ MD
NPI 1235119066
Internal Medicine in Hauppauge, NY
About Ms. Ruth G Diaz Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
MS. RUTH G DIAZ MD (NPI 1235119066) is an individual internal medicine provider in Hauppauge, New York, licensed in New York (116667) and active in the NPI registry since January 2006. She is enrolled in Medicare PECOS and is a graduate of Other (1966).
NPPES Registry Identity
Specialties & Licenses
Other Identifiers 8
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
Ms. Ruth G Diaz 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 Ruth Diaz reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.
Hauppauge, NY 11788
- Reassigned Medicare billing, New York enrollment
- 8 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 2
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 11788 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Other Providers at the Same Location NPPES 7
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
HAUPPAUGE, NY 11788
HAUPPAUGE, NY 11788
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 Ruth Diaz's NPI number?
The NPI number for Ruth Diaz is 1235119066. It was assigned to this individual provider in the NPPES registry on January 18, 2006.
Where is Ruth Diaz located?
Ruth Diaz practices at 515 Route 111 Fl 2, Hauppauge, NY 11788. The listed phone number is (631) 224-1819.
What is Ruth Diaz's specialty?
The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.
Is Ruth Diaz enrolled in Medicare?
Yes. Ruth Diaz 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 Ruth Diaz's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Ruth Diaz reassigns Medicare benefits to Comprehensive Medical Associates PLLC (Hauppauge, 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 Ruth Diaz's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Ruth Diaz accept?
Health plans from Oscar Insurance Company list Ruth Diaz 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.
When was this NPI record last updated?
The NPPES record for Ruth Diaz was last updated on February 25, 2020. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 6 years 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.
# Ms. Ruth G Diaz, MD · NPI 1235119066
Internal Medicine physician in Hauppauge, New York. Individual provider, active in the CMS NPPES registry since January 18, 2006.
## Identity
- **NPI:** 1235119066 (Entity type: Individual)
- **Enumerated:** January 18, 2006
- **Primary specialty:** Internal Medicine · taxonomy 207R00000X
- **State license:** 116667 (New York)
- **Sole proprietor:** Yes
## Practice location
- **Address:** 515 ROUTE 111, FL 2, Hauppauge, NY 11788-4339
- **Phone:** (631) 224-1819 · **Fax:** (631) 224-1812
## 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:** Comprehensive Medical Associates PLLC (NPI 1518208792, Hauppauge, NY), under Medicare reassignment (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 1966
## Record status
- **NPPES last updated:** February 25, 2020
- **Other identifiers:** Other 582902; Other 1309464; Other 26047; and 5 more
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Source: [NPI Profile](https://npiprofile.com/npi/1235119066) · Data from the CMS NPPES public registry.