WILLIAM DUAN MD
NPI 1881334308
Psychiatric Unit in Stockton, CA

NPI Status: Active since March 31, 2022

Contact Information

1800 N CALIFORNIA ST
STOCKTON, CA
ZIP 95204
Phone: (209) 547-5716

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  • Individual
  • Male
  • Psychiatric Unit

About WILLIAM DUAN

This page provides the complete NPI Profile along with additional information for William Duan, a provider established in Stockton, California with a medical specialization in Psychiatric Unit. The healthcare provider is registered in the NPI registry with number 1881334308 assigned on March 2022. The practitioner's primary taxonomy code is 273R00000X with license number A189333 (CA). The provider is registered as an individual and his NPI record was last updated April 2026.

NPI
1881334308
Provider Name
WILLIAM DUAN MD
Gender
Male
Entity Type
Individual
Location Address
1800 N CALIFORNIA ST STOCKTON, CA 95204
Location Phone
(209) 547-5716
Mailing Address
1800 N CALIFORNIA ST STOCKTON, CA 95204
Mailing Phone
(209) 547-5716
Is Sole Proprietor?
No
Enumeration Date
03-31-2022
Last Update Date
04-24-2026
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Specialty - Primary Taxonomy

The NPI enumerator requires providers to submit at least one taxonomy code. A taxonomy code is a unique 10-character code that describes the healthcare provider type, classification, and the area of specialization. There could be only one primary taxonomy code per NPI record. For individual NPIs the license data is associated to the taxonomy code.

Classification

Psychiatric Unit

Taxonomy Code
273R00000X
Type
Hospital Units
License No.
A189333
License State
CA
Taxonomy Description
In general, a distinct unit of a hospital that provides acute or long-term care to emotionally disturbed patients, including patients admitted for diagnosis and those admitted for treatment of psychiatric problems on the basis of physicians' orders and approved nursing care plans. Long-term care may include intensive supervision to the chronically mentally ill, mentally disordered or other mentally incompetent persons; (2) For Medicare, a distinct part of a general acute care hospital admitting only patients whose admission to the unit is required for active treatment, whose treatment is of an intensity that can be provided only in an inpatient hospital setting, and whose condition is described by a psychiatric principal diagnosis contained in the Third Edition of the American Psychiatric Association Diagnostic and Statistical Manual or in Chapter 5 (Mental Disorders) of the International Classification of Diseases, Ninth Revision, Clinical Modification (ICD-9-CM). The unit must furnish, through the use of qualified personnel, psychological services, social work services, psychiatric nursing, occupational therapy, and recreational therapy. The unit must maintain medical records that permit determination of the degree and intensity of treatment provided to individuals who are furnished services in the unit; the unit must meet special staff requirements in that the unit must have adequate numbers of qualified professional and supportive staff to evaluate inpatients, formulate written, individualized, comprehensive treatment plans, provide active treatment measures and engage in discharge planning.

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NPI NPI Number Validation

How NPI Validation Works

The NPI validation process uses the ISO-standard Luhn algorithm, a mathematical "handshake", to ensure that a provider's 10-digit ID is authentic and free of common typing errors.

To verify the NPI 1881334308, we treat the final digit (8) as the Check Digit—the target answer we need to reach. The process begins by taking the first nine digits and adding a constant value of 24, which accounts for the "80840" prefix required for all U.S. health identifiers. We then double every other digit starting from the right and sum the individual digits of those results together. For this specific NPI, that total comes to 62. The final step is to find the difference between that total and the next multiple of ten (70 - 62 = 8).

Digit-by-digit view

Use the first nine digits for the calculation. Starting from the right, double every other digit. The last digit is the check digit and is not part of the calculation.

Pos 1
1
Doubled → 2
Pos 2
8
Unchanged
Pos 3
8
Doubled → 16 → 1 + 6
Pos 4
1
Unchanged
Pos 5
3
Doubled → 6
Pos 6
3
Unchanged
Pos 7
4
Doubled → 8
Pos 8
3
Unchanged
Pos 9
0
Doubled → 0
Check
8
Target digit
Regular digit Doubled digit Check digit

Step 1: Double every other digit from the right

Starting with the rightmost digit of the first nine digits, double every other value. If doubling creates a two-digit number, add those digits together.

1 → 2 8 → 16 → 7 3 → 6 4 → 8 0 → 0

Step 2: Add all digits plus the NPI constant

Add the transformed values, the unchanged digits, and the constant 24.

2 + 8 + 1 + 6 + 1 + 6 + 3 + 8 + 3 + 0 + 24 = 62

Step 3: Find the amount needed to reach the next multiple of 10

The next multiple of ten after 62 is 70. The difference is the calculated check digit.

70 - 62 = 8
This NPI is valid
The calculated check digit is 8, which matches the last digit of 1881334308.

Other Providers at the Same Location


The following 20 providers are registered at the same or a nearby location.

Pharmacist (Pharmacotherapy)
1800 N CALIFORNIA ST, ST. JOSEPH'S MEDICAL CENTER - PHARMACY DEPT
STOCKTON, CA 95204
Pharmacist
1800 N CALIFORNIA ST
STOCKTON, CA 95204
Specialist
1800 N CALIFORNIA ST
STOCKTON, CA 95204
Pharmacist
1800 N CALIFORNIA ST, SJMC PHARMACY DEPARTMENT
STOCKTON, CA 95204
Thoracic Surgery (Cardiothoracic Vascular Surgery)
1800 N CALIFORNIA ST
STOCKTON, CA 95204
Pediatrics (Neonatal-Perinatal Medicine)
1800 N CALIFORNIA ST
STOCKTON, CA 95204
Emergency Medicine
1800 N CALIFORNIA ST
STOCKTON, CA 95204
Internal Medicine
1800 N CALIFORNIA ST
STOCKTON, CA 95204
Pathology (Anatomic Pathology)
1800 N CALIFORNIA ST
STOCKTON, CA 95204
Surgery
1800 N CALIFORNIA ST
STOCKTON, CA 95204
Emergency Medicine
1800 N CALIFORNIA ST
STOCKTON, CA 95204
Dietitian, Registered
1800 N CALIFORNIA ST
STOCKTON, CA 95204
Family Medicine
1800 N CALIFORNIA ST
STOCKTON, CA 95204
Nurse Practitioner (Family)
1800 N CALIFORNIA ST, ST JOESPH MEDICAL CENTER
STOCKTON, CA 95204
Nurse Practitioner (Obstetrics & Gynecology)
1800 N CALIFORNIA ST
STOCKTON, CA 95204
Nurse Practitioner (Family)
1800 N CALIFORNIA ST, ST. JOSEPH'S CAREVAN SERVICES
STOCKTON, CA 95204
Radiology (Therapeutic Radiology)
1800 N CALIFORNIA ST
STOCKTON, CA 95204
Internal Medicine
1800 N CALIFORNIA ST
STOCKTON, CA 95204
Specialist
1800 N CALIFORNIA ST
STOCKTON, CA 95204
Anesthesiology
1800 N CALIFORNIA ST
STOCKTON, CA 95204

Frequently Asked Questions

The NPI number assigned to this healthcare provider is 1881334308, enumerated as an "individual" on March 31, 2022.

The provider is located at 1800 N CALIFORNIA ST STOCKTON, CA 95204 and the phone number is (209) 547-5716.

Psychiatric Unit with taxonomy code 273R00000X.