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DAT WILLIAM NGUYEN MD
NPI 1386626448
Family Medicine in La Mesa, CA

Active since November 15, 2005PECOS Enrolled
5565 GROSSMONT CENTER DR STE 229, LA MESA, CA 91942(858) 349-3760(619) 262-8964 Get Directions Write a Review

NPPES record last updated: August 2, 2023. Verified against the NPPES registry weekly; last sync: October 18, 2026.

About Dat William Nguyen Md NPPES

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

DAT WILLIAM NGUYEN MD (NPI 1386626448) is an individual family medicine provider in La Mesa, California, licensed in California (A83262) and active in the NPI registry since November 2005. He is enrolled in Medicare PECOS.

NPPES Registry Identity

NPI1386626448
Entity TypeIndividualMale
Primary Taxonomy207Q00000X
Provider Legal NameDAT WILLIAM NGUYENCredential: MD
Location Address5565 GROSSMONT CENTER DR STE 229La Mesa, CA 91942-3026
Mailing AddressPo Box 8005Rancho Santa Fe, CA 92067-8005 · (858) 349-3760 · Fax (619) 262-8964
Phone(858) 349-3760
Fax(619) 262-8964
Sole ProprietorYes
Enumeration DateNovember 15, 2005
Last NPPES UpdateAugust 2, 2023
NPPES CertifiedAugust 2, 2023
✔ NPI 1386626448 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyFamily MedicineAllopathic & Osteopathic Physicians
Taxonomy Code207Q00000X
License✔ Licensed in CA · A83262
Definition
Family Medicine is the medical specialty which is concerned with the total health care of the individual and the family. It is the specialty in breadth which integrates the biological, clinical, and behavioral sciences. The scope of family medicine is not limited by age, sex, organ system, or disease entity.
5565 GROSSMONT CENTER DR STE 229, La Mesa, CA 91942
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Medicare Participation & PECOS CMS

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

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Dat William Nguyen 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

3

Medicare enrollment records show Dat Nguyen reassigns Medicare billing to 3 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Carbon Medical Center
11 mi
Internal Medicine
9855 ERMA RD STE 133
San Diego, CA 92131
  • Reassigned Medicare billing, California enrollment
  • 24 clinicians in this Medicare group
NPI 1609678226 (760) 656-5523
Datnguyen MD Inc
11 mi
Internal Medicine
9855 ERMA RD STE 133
San Diego, CA 92131
  • Reassigned Medicare billing, California enrollment
  • Medicare enrollment name: Datnguyen, M.D., Inc.
  • 42 clinicians in this Medicare group
NPI 1215977723 (760) 656-5523
Careconnectmd Ca PC
80 mi
Family Medicine
3090 BRISTOL ST STE 200
Costa Mesa, CA 92626
  • Reassigned Medicare billing, California enrollment
  • 194 clinicians in this Medicare group
NPI 1366063125 (888) 789-9585

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 10

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 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.
1,265 services43 patients
Subsequent nursing facility care with straightforward level of medical decision making, per day, if using time, at least 10 minutes 99307
A follow-up nursing facility visit per day typically lasts about 10 minutes. This service involves a healthcare professional checking on your health status, answering any questions you may have, and monitoring your progress. This routine check ensures your recovery is on track and any concerns are addressed promptly.
729 services81 patients
Established patient office or other outpatient visit with straightforward medical decision making, if using time, 10 minutes or more 99212
This is a routine check-up for patients who have previously seen the doctor. During this 10-19 minute visit, the doctor will review your health status, discuss any concerns, and manage ongoing treatments or medications. It's a chance to ensure your health is on track.
264 services56 patients
Subsequent nursing facility care with high level of medical decision making, per day, if using time, at least 45 minutes 99310
A follow-up nursing facility visit is a routine check-up that typically lasts about 35 minutes. During this visit, your health status is evaluated, any changes in your condition are noted, and necessary adjustments to your care plan are made. It's an essential part of maintaining your health.
218 services63 patients
Initial nursing facility care with high level of medical decision making, per day, if using time, 50 minutes or more 99306
An initial nursing facility visit is your first meeting with your healthcare team at a nursing facility. Lasting typically 45 minutes, this appointment involves a comprehensive health assessment and the creation of your personalized care plan. It's a crucial step to ensure your health and well-being.
69 services58 patients
Detection test by immunoassay with direct visual observation for severe acute respiratory syndrome coronavirus 2 (covid-19) 87811
This is a test to detect COVID-19, the virus causing severe respiratory illness. It uses a method called immunoassay, which identifies the virus by its unique proteins. The test is directly observed for accuracy. It helps determine if you're currently infected.
42 services27 patients

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 91942 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
$94.87 typical visit price
range $62.10 – $184.71
Typical copayment $23.71 (range $15.52 – $46.17)
Most-billed visit code 99203
Established Patient
$108.42 typical visit price
range $20.62 – $151.42
Typical copayment $27.10 (range $5.15 – $37.85)
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.

Referred Medical Equipment & Supplies CMS DME claims 6

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

Enteral feeding supply kit; pump fed, per day, includes but not limited to feeding/flushing syringe, administration set tubing, dressings, tape B4035
Other-Enteral and Parenteral · category OB006N
3 suppliers14 claims398 services$4.35 avg. paid by Medicare
Enteral formula, nutritionally complete, calorically dense (equal to or greater than 1.5 kcal/ml) with intact nutrients, includes proteins, fats, carbohydrates, vitamins and minerals, may include fiber, administered through an enteral feeding tube, 100 calories = 1 unit B4152
Other-Enteral and Parenteral · category OB006N
3 suppliers14 claims7,699 services$0.27 avg. paid by Medicare
Portable gaseous oxygen system, rental; includes portable container, regulator, flowmeter, humidifier, cannula or mask, and tubing E0431
DME-Oxygen and Supplies · category DC000N
2 suppliers44 claims44 services$13.35 avg. paid by Medicare
Home ventilator, any type, used with non-invasive interface, (e.g., mask, chest shell) E0466
DME-Other DME · category DE005N
1 supplier12 claims12 services$784.18 avg. paid by Medicare
Iv pole E0776
DME-Other DME · category DE000N
3 suppliers13 claims13 services$8.68 avg. paid by Medicare
Oxygen concentrator, single delivery port, capable of delivering 85 percent or greater oxygen concentration at the prescribed flow rate E1390
DME-Oxygen and Supplies · category DC002N
2 suppliers54 claims54 services$57.16 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 2

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

SAN DIEGO HOSPITALIST NETWORK, A.P.C.
Internal Medicine
5565 GROSSMONT CENTER DR STE 229
LA MESA, CA 91942
San Diego County (858) 349-3760
BRANDON CHANG HWUN RO MSN, PMHNP
Nurse Practitioner (Psychiatric/Mental Health)
5565 GROSSMONT CENTER DR STE 229
LA MESA, CA 91942
San Diego County (858) 342-4572

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 Dat Nguyen's NPI number?

The NPI number for Dat Nguyen is 1386626448. It was assigned to this individual provider in the NPPES registry on November 15, 2005.

Where is Dat Nguyen located?

Dat Nguyen practices at 5565 Grossmont Center Dr Ste 229, La Mesa, CA 91942. The listed phone number is (858) 349-3760.

What is Dat Nguyen's specialty?

The primary specialty registered for this NPI is Family Medicine with taxonomy code 207Q00000X.

Is Dat Nguyen enrolled in Medicare?

Yes. Dat Nguyen is registered in the Medicare PECOS enrollment system.

Which organizations bill Medicare for Dat Nguyen's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Dat Nguyen reassigns Medicare benefits to 3 organizations: Carbon Medical Center (San Diego, CA), Datnguyen MD Inc (San Diego, CA) and Careconnectmd Ca PC (Costa Mesa, 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 Dat Nguyen'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 Dat Nguyen was last updated on August 2, 2023. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 3 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.