JOHN MASSARO DO
NPI 1588665293
Internal Medicine in San Luis Obispo, CA
About John Massaro Do NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
JOHN MASSARO DO (NPI 1588665293) is an individual internal medicine provider in San Luis Obispo, California, licensed in California (20A7971) and active in the NPI registry since August 2005. He is enrolled in Medicare PECOS.
NPPES Registry Identity
Specialties & Licenses
Other Identifiers 1
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare (PECOS)
John Massaro Do is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).
Medicare Billing Reassignment
Medicare enrollment records show John Massaro reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.
San Luis Obispo, CA 93405
- Reassigned Medicare billing, California enrollment
- 17 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.
Physician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 93401 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 John Massaro's NPI number?
The NPI number for John Massaro is 1588665293. It was assigned to this individual provider in the NPPES registry on August 3, 2005.
Where is John Massaro located?
John Massaro practices at 975 Osos St, San Luis Obispo, CA 93401. The listed phone number is (805) 549-0677.
What is John Massaro's specialty?
The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.
Is John Massaro enrolled in Medicare?
Yes. John Massaro is registered in the Medicare PECOS enrollment system.
Which organization bills Medicare for John Massaro's services?
According to the CMS Revalidation Reassignment List (October 2026 release), John Massaro reassigns Medicare benefits to Coastal Communities Physician Network, Inc. (San Luis Obispo, CA). 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 John Massaro'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 John Massaro was last updated on November 30, 2011. 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.
# John Massaro, DO · NPI 1588665293
Internal Medicine physician in San Luis Obispo, California. Individual provider, active in the CMS NPPES registry since August 3, 2005.
## Identity
- **NPI:** 1588665293 (Entity type: Individual)
- **Enumerated:** August 3, 2005
- **Primary specialty:** Internal Medicine · taxonomy 207R00000X
- **State license:** 20A7971 (California)
- **Sole proprietor:** No
## Practice location
- **Address:** 975 OSOS ST, San Luis Obispo, CA 93401-3212
- **Phone:** (805) 549-0677
## Medicare
- **Medicare:** Enrolled in Medicare (PECOS)
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** Coastal Communities Physician Network, Inc. (NPI 1275735011, San Luis Obispo, CA), under Medicare reassignment (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
## Record status
- **NPPES last updated:** November 30, 2011
- **Other identifiers:** Medicare UPIN H55507 (CA)
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Source: [NPI Profile](https://npiprofile.com/npi/1588665293) · Data from the CMS NPPES public registry.