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

WATSON A DESA MD
NPI 1235185620
Internal Medicine - Interventional Cardiology in Los Alamitos, CA

Active since May 26, 2006PECOS EnrolledAccepts Medicare Assignment
3851 KATELLA AVE STE 305, LOS ALAMITOS, CA 90720(562) 594-6080(562) 594-6030 Get Directions Write a Review

NPPES record last updated: April 13, 2023. Verified against the NPPES registry weekly; last sync: October 18, 2026.

About Watson A Desa Md NPPES

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

WATSON A DESA MD (NPI 1235185620) is an individual interventional cardiology provider in Los Alamitos, California, licensed in California (A32717) and active in the NPI registry since May 2006. He is enrolled in Medicare PECOS and is a graduate of Other (1973).

NPPES Registry Identity

NPI1235185620
Entity TypeIndividualMale
Primary Taxonomy207RI0011X
Provider Legal NameWATSON A DESACredential: MD
Location Address3851 KATELLA AVE STE 305Los Alamitos, CA 90720-3390
Mailing Address3851 Katella Ave Ste 305Los Alamitos, CA 90720-3390 · (562) 594-6080 · Fax (562) 594-6030
Phone(562) 594-6080
Fax(562) 594-6030
Sole ProprietorYes
Medical School CMSOtherGraduated 1973
Enumeration DateMay 26, 2006
Last NPPES UpdateApril 13, 2023
NPPES CertifiedApril 13, 2023
✔ NPI 1235185620 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal Medicine · Interventional CardiologyAllopathic & Osteopathic Physicians
Taxonomy Code207RI0011X
License✔ Licensed in CA · A32717
Definition
An area of medicine within the subspecialty of cardiology, which uses specialized imaging and other diagnostic techniques to evaluate blood flow and pressure in the coronary arteries and chambers of the heart and uses technical procedures and medications to treat abnormalities that impair the function of the cardiovascular system.
3851 KATELLA AVE STE 305, Los Alamitos, CA 90720
Open in Google Maps ↗

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

Watson A Desa Md 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 ID3173527157
PECOS Enrollment IDI20060905000562
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 Watson Desa reassigns Medicare billing to 3 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Adoracion Reyes MD A Professional Medical Corporation
3.9 mi
Family
11618 SOUTH ST STE 214
Artesia, CA 90701
  • Reassigned Medicare billing, California enrollment
  • 8 clinicians in this Medicare group
NPI 1457196164 (562) 310-6703
Watson A. Desa, MD, A Medical Corp
7.1 mi
Medical Specialty
1050 LINDEN AVE
Long Beach, CA 90813
  • Reassigned Medicare billing, California enrollment
NPI 1982616439 (562) 594-6080
Department Of State Hospitals
8.6 mi
Psychiatric Hospital
11401 BLOOMFIELD AVE
Norwalk, CA 90650
  • Reassigned Medicare billing, California enrollment
  • 755 clinicians in this Medicare group
NPI 1265406565 (562) 863-7011

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 9

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.

Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report only 93010
A routine electrocardiogram (ECG) with 12 leads is a simple, non-invasive test that records the electrical activity of your heart. It helps in identifying heart conditions by detecting irregularities in your heart rhythms. The results are interpreted and a report is provided.
376 services287 patients
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.
331 services57 patients
Ultrasound of heart with color-depicted blood flow, rate, direction and valve function 93306
This is a heart ultrasound, also known as an echocardiogram. It uses sound waves to create pictures of your heart, showing how blood flows through it. The color depicts the blood flow's speed and direction. It also checks the heart's valves to ensure they're working properly.
150 services145 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.
109 services69 patients
Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more 99213
This is a routine visit for patients who have already been seen by the healthcare provider. During this approximately 20-29 minute appointment, your health status will be evaluated and any necessary treatments or tests will be discussed. It's a chance to address any health concerns you may have.
71 services35 patients
Ultrasound of heart with color-depicted blood flow, rate, direction and valve function 93306
This is a heart ultrasound, also known as an echocardiogram. It uses sound waves to create pictures of your heart, showing how blood flows through it. The color depicts the blood flow's speed and direction. It also checks the heart's valves to ensure they're working properly.
26 services26 patients

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 90720 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.

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 Watson Desa's NPI number?

The NPI number for Watson Desa is 1235185620. It was assigned to this individual provider in the NPPES registry on May 26, 2006.

Where is Watson Desa located?

Watson Desa practices at 3851 Katella Ave Ste 305, Los Alamitos, CA 90720. The listed phone number is (562) 594-6080.

What is Watson Desa's specialty?

The primary specialty registered for this NPI is Internal Medicine, specializing in Interventional Cardiology, with taxonomy code 207RI0011X.

Is Watson Desa enrolled in Medicare?

Yes. Watson Desa 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 Watson Desa's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Watson Desa reassigns Medicare benefits to 3 organizations: Adoracion Reyes MD A Professional Medical Corporation (Artesia, CA), Watson A. Desa, MD, A Medical Corp (Long Beach, CA) and Department Of State Hospitals (Norwalk, 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 Watson Desa'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 Watson Desa was last updated on April 13, 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.