DR. WILLIAM WAN KAO M.D.
NPI 1821257924
Urology in Largo, MD
About Dr. William Wan Kao M.d. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. WILLIAM WAN KAO M.D. (NPI 1821257924) is an individual urology provider in Largo, Maryland, licensed in Maryland (D0068713) and active in the NPI registry since June 2008. He is enrolled in Medicare PECOS, is affiliated with Holy Cross Hospital, and is a graduate of Other (2004).
NPPES Registry Identity
Specialties & Licenses
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. William Wan Kao 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 Reassignment
Medicare enrollment records show William Kao reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.
Largo, MD 20774
- Reassigned Medicare billing, District of Columbia enrollment
- Also billed through NPI 1730200965 (District of Columbia), NPI 1578638425 (District of Columbia)
- 752 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 3
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
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Holy Cross Hospital
Acute Care Hospitals · Silver Spring, MDPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 20774 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 20
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
LARGO, MD 20774
LARGO, MD 20774
LARGO, MD 20774
LARGO, MD 20774
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 William Kao's NPI number?
The NPI number for William Kao is 1821257924. It was assigned to this individual provider in the NPPES registry on June 3, 2008.
Where is William Kao located?
William Kao practices at 1221 Mercantile Ln, Largo, MD 20774. The listed phone number is (301) 618-5633.
What is William Kao's specialty?
The primary specialty registered for this NPI is Urology with taxonomy code 208800000X.
Is William Kao enrolled in Medicare?
Yes. William Kao 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 William Kao's services?
According to the CMS Revalidation Reassignment List (October 2026 release), William Kao reassigns Medicare benefits to Kaiser Foundation Health Plan Of The Mid Atlantic States, Inc (Largo, MD). 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 William Kao's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
Is William Kao affiliated with any hospitals?
According to CMS data, William Kao is affiliated with Holy Cross Hospital.
When was this NPI record last updated?
The NPPES record for William Kao was last updated on June 22, 2021. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 5 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. William Wan Kao, M.D. · NPI 1821257924
Urology physician in Largo, Maryland. Individual provider, active in the CMS NPPES registry since June 3, 2008.
## Identity
- **NPI:** 1821257924 (Entity type: Individual)
- **Enumerated:** June 3, 2008
- **Primary specialty:** Urology · taxonomy 208800000X
- **State license:** D0068713 (Maryland)
- **Sole proprietor:** No
## Practice location
- **Address:** 1221 MERCANTILE LN, Largo, MD 20774-5374
- **Phone:** (301) 618-5633 · **Fax:** (301) 618-7205
## 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:** Kaiser Foundation Health Plan Of The Mid Atlantic States, Inc (NPI 1366781700, Largo, MD), under Medicare reassignment (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2004
## Record status
- **NPPES last updated:** June 22, 2021
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Source: [NPI Profile](https://npiprofile.com/npi/1821257924) · Data from the CMS NPPES public registry.