CALVIN CHIH-CHIA WU M.D.
NPI 1659646891
Internal Medicine - Endocrinology, Diabetes & Metabolism in Glendale, CA
About Calvin Chih-chia Wu M.d. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
CALVIN CHIH-CHIA WU M.D. (NPI 1659646891) is an individual endocrinology, diabetes & metabolism provider in Glendale, California, licensed in California (A122403) and active in the NPI registry since March 2012. He is enrolled in Medicare PECOS, maintains a secondary practice location in Palo Alto, and is a graduate of Other (2011).
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
Calvin Chih-chia Wu M.d. 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
3Medicare enrollment records show Calvin Wu reassigns Medicare billing to 3 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
San Diego, CA 92101
- Reassigned Medicare billing, California enrollment
- 2 clinicians in this Medicare group
Mountain View, CA 94040
- Reassigned Medicare billing, California enrollment
- 4 clinicians in this Medicare group
Palo Alto, CA 94301
- Reassigned Medicare billing, California enrollment
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 91203 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 18
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
GLENDALE, CA 91203
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 Calvin Wu's NPI number?
The NPI number for Calvin Wu is 1659646891. It was assigned to this individual provider in the NPPES registry on March 21, 2012.
Where is Calvin Wu located?
Calvin Wu practices at 330 N Brand Blvd Ste 700, Glendale, CA 91203. The listed phone number is (917) 382-0901.
What is Calvin Wu's specialty?
The primary specialty registered for this NPI is Internal Medicine, specializing in Endocrinology, Diabetes & Metabolism, with taxonomy code 207RE0101X.
Is Calvin Wu enrolled in Medicare?
Yes. Calvin Wu 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 Calvin Wu's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Calvin Wu reassigns Medicare benefits to 3 organizations: Tono Medical Services PC (San Diego, CA), (Mountain View, CA) and Codex Medical Group PC (Palo Alto, CA). 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 Calvin Wu'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 Calvin Wu was last updated on October 26, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 11 days 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.
# Calvin Chih-Chia Wu, M.D. · NPI 1659646891
Endocrinology, Diabetes & Metabolism physician in Glendale, California. Individual provider, active in the CMS NPPES registry since March 21, 2012.
## Identity
- **NPI:** 1659646891 (Entity type: Individual)
- **Enumerated:** March 21, 2012
- **Primary specialty:** Internal Medicine - Endocrinology, Diabetes & Metabolism · taxonomy 207RE0101X
- **State license:** A122403 (California)
- **Sole proprietor:** Yes
## Practice location
- **Address:** 330 N BRAND BLVD STE 700, Glendale, CA 91203-2336
- **Phone:** (917) 382-0901
## 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:** 3 organizations under Medicare reassignment (form CMS-855R): Tono Medical Services PC (NPI 1477244671, San Diego, CA); (NPI 1558447847, Mountain View, CA); Codex Medical Group PC (NPI 1912843509, Palo Alto, CA) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2011
## Record status
- **NPPES last updated:** October 26, 2026
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Source: [NPI Profile](https://npiprofile.com/npi/1659646891) · Data from the CMS NPPES public registry.