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DR. KOK-TONG LING M.D.
NPI 1164400263
Internal Medicine - Nephrology in San Francisco, CA

Active since January 09, 2006PECOS EnrolledAccepts Medicare AssignmentCLIA 05D0929392 · Waiver
450 SUTTER ST., SUITE 935, SAN FRANCISCO, CA 94108(415) 433-7761(415) 433-7763 Get Directions Write a Review

NPPES record last updated: October 24, 2007. Verified against the NPPES registry weekly; last sync: October 25, 2026.

About Dr. Kok-tong Ling M.d. NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

DR. KOK-TONG LING M.D. (NPI 1164400263) is an individual nephrology provider in San Francisco, California, licensed in California (A45478) and active in the NPI registry since January 2006. He is enrolled in Medicare PECOS, holds a CLIA Waiver certificate valid through June 11, 2027, and is a graduate of Other (1984).

NPPES Registry Identity

NPI1164400263
Entity TypeIndividualMale
Primary Taxonomy207RN0300X
Provider Legal NameDR. KOK-TONG LINGCredential: M.D.
Location Address450 SUTTER ST., SUITE 935San Francisco, CA 94108
Mailing Address450 Sutter St., Suite 935San Francisco, CA 94108 · (415) 433-7761 · Fax (415) 433-7763
Phone(415) 433-7761
Fax(415) 433-7763
Sole ProprietorYes
Medical School CMSOtherGraduated 1984
Enumeration DateJanuary 9, 2006
Last NPPES UpdateOctober 24, 2007
✔ NPI 1164400263 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyInternal Medicine · NephrologyAllopathic & Osteopathic Physicians
Taxonomy Code207RN0300X
License✔ Licensed in CA · A45478
Definition
An internist who treats disorders of the kidney, high blood pressure, fluid and mineral balance and dialysis of body wastes when the kidneys do not function. This specialist consults with surgeons about kidney transplantation.
Also ListedInternal MedicineTaxonomy 207R00000X · License A45478 (CA)
450 SUTTER ST., SUITE 935, San Francisco, CA 94108
Open in Google Maps ↗

Other Identifiers 3

Medicare ID-Type Unspecified00A454780CA
Medicaid00A454780CA
Medicare UPINF15769CA

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. Kok-tong Ling 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.

PECOS PAC ID9739260662
PECOS Enrollment IDI20080117000268
Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Medicare Billing Reassignments

4

Medicare enrollment records show Kok-tong Ling reassigns Medicare billing to 4 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Regents Of The University Of California
1.8 mi
Endocrinology, Diabetes & Metabolism
1600 DIVISADERO ST
San Francisco, CA 94143
  • Reassigned Medicare billing, California enrollment
  • 2,112 clinicians in this Medicare group
NPI 1235322348 (415) 353-9720
University Of California Sfgh Medical Group
2.3 mi
Medical Oncology
995 POTRERO AVE, BLDG.80, RM 229
San Francisco, CA 94110
  • Reassigned Medicare billing, California enrollment
  • Also billed through NPI 1063487122 (California)
  • 637 clinicians in this Medicare group
NPI 1356696215 (415) 476-4082
University Of California San Francisco
3.3 mi
Surgery
400 PARNASSUS AVE, MCB 300
San Francisco, CA 94143
  • Reassigned Medicare billing, California enrollment
  • 5,645 clinicians in this Medicare group
NPI 1346329380 (415) 353-2161
Ucsf Medical Group Business Services
3.3 mi
Internal Medicine
400 PARNASSUS AVE
San Francisco, CA 94122
  • Reassigned Medicare billing, California enrollment
  • 5,544 clinicians in this Medicare group
NPI 1477624104 (415) 353-2808

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

CLIA Laboratory Certificates CMS CLIA

Laboratory certificates issued under the Clinical Laboratory Improvement Amendments (CLIA) program, which sets federal quality standards for human laboratory testing in the United States. There is no official CMS crosswalk between CLIA and NPI numbers; these certificates are associated with this NPI by matching facility names, locations and phone numbers in the CMS CLIA registry.

Certificate of Waiver 05D0929392

Kok-Tong Ling MD · San Francisco, CA
Active · expires Jun 11, 2027
CLIA Number05D0929392
Laboratory TypePhysician Office
Certificate Effective DateJune 12, 2025
Certificate Expiration DateJune 11, 2027
Laboratory DirectorKoktong Ling MD
Laboratory Phone(415) 433-7761
Laboratory LocationKok-Tong Ling MD450 Sutter Street Suite 935, San Francisco, CA 94108
CLIA data matches this NPI record on: Address Name Phone
This certificate is issued to a laboratory to perform only waived tests.

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.

Dialysis services, 2-3 physician visits per month (20 years or older) 90961
Dialysis is a treatment that performs the function of healthy kidneys if they're not working properly. It removes waste and excess fluid from your blood. 2-3 physician visits per month are recommended for monitoring your health and adjusting your treatment as needed. This service is available for those aged 20 years and older.
226 services25 patients
Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more 99214
This is a routine check-up for patients who have previously visited our clinic. It involves a comprehensive review of your health and any ongoing treatments. The consultation lasts between 30-39 minutes, allowing enough time to discuss any concerns.
96 services43 patients

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 94108 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient
$153.83 typical visit price
range $69.00 – $202.35
Typical copayment $38.45 (range $17.25 – $50.58)
Most-billed visit code 99204
Established Patient
$119.48 typical visit price
range $23.44 – $166.46
Typical copayment $29.87 (range $5.86 – $41.61)
Most-billed visit code 99214
Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

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 Kok-tong Ling's NPI number?

The NPI number for Kok-tong Ling is 1164400263. It was assigned to this individual provider in the NPPES registry on January 9, 2006.

Where is Kok-tong Ling located?

Kok-tong Ling practices at 450 Sutter St., Suite 935, San Francisco, CA 94108. The listed phone number is (415) 433-7761.

What is Kok-tong Ling's specialty?

The primary specialty registered for this NPI is Internal Medicine, specializing in Nephrology, with taxonomy code 207RN0300X.

Is Kok-tong Ling enrolled in Medicare?

Yes. Kok-tong Ling 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 Kok-tong Ling's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Kok-tong Ling reassigns Medicare benefits to 4 organizations: Regents Of The University Of California (San Francisco, CA), University Of California Sfgh Medical Group (San Francisco, CA), University Of California San Francisco (San Francisco, CA) and Ucsf Medical Group Business Services (San Francisco, 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 Kok-tong Ling's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

Does Kok-tong Ling hold a CLIA laboratory certificate?

Yes. A Certificate of Waiver (number 05D0929392) is associated with this NPI, valid through June 11, 2027. CLIA certificates authorize laboratory testing under the federal Clinical Laboratory Improvement Amendments program.

When was this NPI record last updated?

The NPPES record for Kok-tong Ling was last updated on October 24, 2007. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 19 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.