1. Home
  2. Directory
  3. California
  4. Los Angeles
  5. Internal Medicine
  6. NPI Profile

WILLIAM T SINGH MD
NPI 1346603610
Internal Medicine in Los Angeles, CA

Active since April 03, 2016PECOS Enrolled
76.26/100
CMS Quality Rating
1200 N STATE ST, CT-A7D, LOS ANGELES, CA 90033(323) 226-7556(323) 226-2657 Get Directions Write a Review

NPPES record last updated: October 15, 2021. Verified against the NPPES registry weekly; last sync: October 25, 2026.

Record update history: Oct 15, 2021, Apr 3, 2016 (2 updates tracked since 2016).

About William T Singh Md NPPES

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

WILLIAM T SINGH MD (NPI 1346603610) is an individual internal medicine provider in Los Angeles, California, licensed in California (A150713) and active in the NPI registry since April 2016. He is enrolled in Medicare PECOS.

NPPES Registry Identity

NPI1346603610
Entity TypeIndividualMale
Primary Taxonomy207R00000X
Provider Legal NameWILLIAM T SINGHCredential: MD
Location Address1200 N STATE ST, CT-A7DLos Angeles, CA 90033-1029
Mailing Address1225 Wilshire BlvdLos Angeles, CA 90017-1901 · (213) 977-2121
Phone(323) 226-7556
Fax(323) 226-2657
Sole ProprietorYes
Enumeration DateApril 3, 2016
Last NPPES UpdateOctober 15, 20212 updates tracked since enumeration
NPPES CertifiedOctober 15, 2021
✔ NPI 1346603610 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyInternal MedicineAllopathic & Osteopathic Physicians
Taxonomy Code207R00000X
License✔ Licensed in CA · A150713
Definition
A physician who provides long-term, comprehensive care in the office and the hospital, managing both common and complex illness of adolescents, adults and the elderly. Internists are trained in the diagnosis and treatment of cancer, infections and diseases affecting the heart, blood, kidneys, joints and digestive, respiratory and vascular systems. They are also trained in the essentials of primary care internal medicine, which incorporates an understanding of disease prevention, wellness, substance abuse, mental health and effective treatment of common problems of the eyes, ears, skin, nervous system and reproductive organs.
Also ListedStudent in an Organized Health Care Education/Training ProgramTaxonomy 390200000X
1200 N STATE ST, Los Angeles, CA 90033
Open in Google Maps ↗

Other Identifiers 1

MedicaidWS3232267556CA

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

William T Singh Md is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

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

2

Medicare enrollment records show William Singh reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Pih Health Physicians
3.3 mi
Internal Medicine
1245 WILSHIRE BLVD, STE 307, 430, 470, 480, 530, 690, 804, 905
Los Angeles, CA 90017
  • Reassigned Medicare billing, California enrollment
  • 840 clinicians in this Medicare group
NPI 1194394064 (213) 482-2770
Can Emergency Physicians Medical Group, Inc.
18 mi
Emergency Medicine
14850 ROSCOE BLVD
Panorama City, CA 91402
  • Reassigned Medicare billing, California enrollment
  • 121 clinicians in this Medicare group
NPI 1265810006 (408) 559-2011

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 6

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.

Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes 99232
Follow-up hospital inpatient care involves daily check-ups while you're admitted in the hospital. Typically, a healthcare provider spends about 25 minutes each day reviewing your condition, adjusting treatment if needed, and answering any questions you might have.
253 services131 patients
Hospital discharge day management, 30 minutes or less 99238
Hospital discharge day management of 30 minutes or less includes finalizing your treatment, discussing your progress, and planning after-care at home. It ensures you're ready to leave the hospital and continue recovery safely.
101 services98 patients
Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes 99233
Follow-up hospital inpatient care per day typically involves a 35-minute check-up by your healthcare provider. This service includes monitoring your health progress, adjusting your treatment plan if needed, and answering any questions you may have about your condition or care.
80 services55 patients
Hospital discharge day management, more than 30 minutes 99239
Hospital discharge day management over 30 minutes involves a detailed process to ensure a smooth transition from hospital to home. It includes final examinations, discussion of your hospital stay, post-discharge instructions, and coordinating follow-up care.
28 services28 patients
Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes 99222
Initial hospital inpatient care is a service where a healthcare provider spends about 50 minutes per day overseeing your care while you're admitted in the hospital. This includes reviewing your health status, planning your treatment, and ensuring your safety and comfort.
19 services19 patients
Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes 99223
Initial hospital inpatient care per day, typically 70 minutes, refers to the daily medical service provided to patients admitted to the hospital. This includes a comprehensive evaluation, diagnosis, treatment plan, and monitoring of your health condition. It ensures your well-being during your hospital stay.
12 services12 patients

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 90033 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
$142.39 typical visit price
range $62.96 – $187.60
Typical copayment $35.59 (range $15.74 – $46.90)
Most-billed visit code 99204
Established Patient
$109.96 typical visit price
range $20.84 – $153.61
Typical copayment $27.49 (range $5.21 – $38.40)
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.

Medicare Quality Performance CMS QPP · MIPS

Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.

76.26/100
MIPS Final ScoreMerit-based Incentive Payment System · CMS Quality Payment Program
Scored as part of a group practice
Quality62.74
Improvement Activities40
Cost59.29

Referred Medical Equipment & Supplies CMS DME claims

Durable medical equipment, devices and supplies this provider ordered from DME suppliers for patients, from Medicare fee-for-service claims.

Standard wheelchair K0001
DME-Wheelchairs · category DD000N
2 suppliers13 claims13 services$20.77 avg. paid by Medicare
Dollar amounts are the average Medicare paid the supplier per service. They are not the cost to the patient.

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.

DR. LUCILLE CHAILLE
Orthopaedic Surgery
1200 N STATE ST
LOS ANGELES, CA 90033
Los Angeles County (323) 226-2170
DR. THIENDANG VIET NGUYEN M.D.
Anesthesiology
1200 N STATE ST, #14-901
LOS ANGELES, CA 90033
Los Angeles County (323) 409-7748
DR. PHIL ORALLO CASTILLO M.D.
Anesthesiology
1200 N STATE ST, ROOM 14-901
LOS ANGELES, CA 90033
Los Angeles County (323) 226-4597
NOA CARTER STERLING M.D.
Obstetrics & Gynecology
1200 N STATE ST, INPT TOWER C3F107
LOS ANGELES, CA 90033
Los Angeles County (323) 409-8847
CHRYSTAL LYNNE JONES RCP
Respiratory Therapist, Certified (Critical Care)
1200 N STATE ST
LOS ANGELES, CA 90033
Los Angeles County (323) 409-1000
MAY SUNDONGMEI WU RESP THERAPIST
Respiratory Therapist, Registered (Critical Care)
1200 N STATE ST
LOS ANGELES, CA 90033
Los Angeles County (323) 409-1824
BRETT BARRO
Student in an Organized Health Care Education/Training Program
1200 N STATE ST, CLINIC TOWER SUITE A7D
LOS ANGELES, CA 90033
Los Angeles County (213) 705-5282
ALBERT CHEN MD
Student in an Organized Health Care Education/Training Program
1200 N STATE ST, CLINIC TOWER, SUITE A7D
LOS ANGELES, CA 90033
Los Angeles County (323) 442-7686

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 Singh's NPI number?

The NPI number for William Singh is 1346603610. It was assigned to this individual provider in the NPPES registry on April 3, 2016.

Where is William Singh located?

William Singh practices at 1200 N State St Ct-A7d, Los Angeles, CA 90033. The listed phone number is (323) 226-7556.

What is William Singh's specialty?

The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.

Is William Singh enrolled in Medicare?

Yes. William Singh is registered in the Medicare PECOS enrollment system.

Which organizations bill Medicare for William Singh's services?

According to the CMS Revalidation Reassignment List (October 2026 release), William Singh reassigns Medicare benefits to 2 organizations: Pih Health Physicians (Los Angeles, CA) and Can Emergency Physicians Medical Group, Inc. (Panorama City, 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 William Singh'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 William Singh was last updated on October 15, 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.