DR. NATHANIEL G CLARK MD
NPI 1386687234
Internal Medicine - Endocrinology, Diabetes & Metabolism in Hyannis, MA
About Dr. Nathaniel G Clark Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. NATHANIEL G CLARK MD (NPI 1386687234) is an individual endocrinology, diabetes & metabolism provider in Hyannis, Massachusetts, licensed in Massachusetts (72154) and active in the NPI registry since June 2006. He is enrolled in Medicare PECOS, is affiliated with Cape Cod Hospital, and is a graduate of University Of Massachusetts Medical School (1988).
NPPES Registry Identity
Specialties & Licenses
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
Dr. Nathaniel G Clark 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
2Medicare enrollment records show Nathaniel Clark reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Hyannis, MA 02601
- Reassigned Medicare billing, Massachusetts enrollment
- 423 clinicians in this Medicare group
Plymouth, MA 02360
- Reassigned Medicare billing, Massachusetts enrollment
- 239 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.
Hospital Affiliations CMS Care Compare 2
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Cape Cod Hospital
Acute Care Hospitals · Hyannis, MAFalmouth Hospital
Acute Care Hospitals · Falmouth, MAPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 02601 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Referred Medical Equipment & Supplies CMS DME claims 8
Durable medical equipment, devices and supplies this provider ordered from DME suppliers for patients, from Medicare fee-for-service claims.
Other Providers at the Same Location NPPES 16
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
HYANNIS, MA 02601
HYANNIS, MA 02601
HYANNIS, MA 02601
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 Nathaniel Clark's NPI number?
The NPI number for Nathaniel Clark is 1386687234. It was assigned to this individual provider in the NPPES registry on June 14, 2006.
Where is Nathaniel Clark located?
Nathaniel Clark practices at 433 W Main St, Hyannis, MA 02601. The listed phone number is (508) 778-4777.
What is Nathaniel Clark's specialty?
The primary specialty registered for this NPI is Internal Medicine, specializing in Endocrinology, Diabetes & Metabolism, with taxonomy code 207RE0101X.
Is Nathaniel Clark enrolled in Medicare?
Yes. Nathaniel Clark 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 Nathaniel Clark's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Nathaniel Clark reassigns Medicare benefits to 2 organizations: Medical Affiliates Of Cape Cod, Inc. (Hyannis, MA) and Jordan Physician Associates, Inc. (Plymouth, MA). 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 Nathaniel Clark's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Nathaniel Clark accept?
Health plans from Taro Health list Nathaniel Clark 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 Nathaniel Clark affiliated with any hospitals?
According to CMS data, Nathaniel Clark is affiliated with Cape Cod Hospital and Falmouth Hospital.
When was this NPI record last updated?
The NPPES record for Nathaniel Clark was last updated on September 27, 2012. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 14 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.
# Dr. Nathaniel G Clark, MD · NPI 1386687234
Endocrinology, Diabetes & Metabolism physician in Hyannis, Massachusetts. Individual provider, active in the CMS NPPES registry since June 14, 2006.
## Identity
- **NPI:** 1386687234 (Entity type: Individual)
- **Enumerated:** June 14, 2006
- **Primary specialty:** Internal Medicine - Endocrinology, Diabetes & Metabolism · taxonomy 207RE0101X
- **State license:** 72154 (Massachusetts)
- **Sole proprietor:** No
## Practice location
- **Address:** 433 W MAIN ST, Hyannis, MA 02601-3644
- **Phone:** (508) 778-4777 · **Fax:** (508) 771-9555
## 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:** 2 organizations under Medicare reassignment (form CMS-855R): Medical Affiliates Of Cape Cod, Inc. (NPI 1770534927, Hyannis, MA); Jordan Physician Associates, Inc. (NPI 1538145131, Plymouth, MA) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** University Of Massachusetts Medical School, class of 1988
## Record status
- **NPPES last updated:** September 27, 2012
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Source: [NPI Profile](https://npiprofile.com/npi/1386687234) · Data from the CMS NPPES public registry.