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Edit this profileAt a glance
- 30230 Rancho Viejo Rd, Suite 200, San Juan Capistrano, CA 92675
About Dr. Chang
William W. Chang, D.O. practices pulmonary disease in San Juan Capistrano, CA. William is a 2000 graduate of Michigan State University College of Osteopathic Medicine. William is also listed as specializing in specialist and critical care medicine. Medicare claims data shows William provided 5,736 services to 3,411 patients. The services billed most often include established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more, visit complexity inherent to evaluation and management associated with medical care services that serve as the continuing focal point for all needed health care services and/or with medical care services that are part of ongoing care related to a patient', and evaluation of use of breathing device. The provider's National Provider Identifier (NPI) is 1417902149.
Factual summary compiled by Guide.md from public records; not written by this provider.
Education & Training
Specialty
Credentials & Licensing
Medicare information
Exactly as CMS reports it (National Downloadable File, Opt-Out Affidavits, Order & Referring). Not an insurance directory; confirm coverage with the office.
Contact Information
- (714) 571-5000
- Email not available
Practice Locations
30230 RANCHO VIEJO RD SUITE 200
San Juan Capistrano, CA 92675
Conditions Commonly Evaluated or Treated
Within Pulmonary Disease generally. Availability varies by clinician, training and location — this profile has not been claimed, so nothing here is a personal claim by the provider.
Conditions
Chronic conditions
Most searched conditions
Airway disorders
Blood vessel disorders
Critical care
Diagnostic findings
Environmental lung diseases
Genetic conditions
Infections
- Community-acquired pneumonia
- Fungal lung infection
- Legionnaires' Disease
- Lung abscess
- NTM lung infection
- Severe Pneumonia
- Tuberculosis
- Valley fever
- Walking Pneumonia in Children
- Whooping Cough
Inflammatory conditions
Lung growths
Occupational & environmental
Pleural disorders
Post-infection conditions
Sleep disorders
- Excessive daytime sleepiness
- Shallow Breathing In Sleep
- Snoring
- Upper Airway Resistance Syndrome
- Waking Up Gasping Or Choking
Structural lung conditions
Symptoms
- Blue Baby Syndrome
- Chest congestion
- Coughing up blood
- Low oxygen levels
- Rapid Breathing
- Severe asthma attack
- Wheezing
Procedures & services
Biopsies
Breathing
- CPAP Setup and Mask Troubleshooting
- Home Oxygen Therapy Training
- Nebulizer Breathing Treatment Training
Pleural procedures
- Draining lung fluid
- Chest tube insertion
- Medical thoracoscopy
- Permanent chest drain insertion
- Pleural sealing procedure
Sleep medicine
- At-home sleep test
- BiPAP therapy
- CPAP titration
- Overnight oxygen study
- Sleep study
Treatments
Most searched procedures
Airway care
Airway management
Biopsies & diagnostics
Breathing tests
- 6-minute walk test
- Asthma challenge test
- Cardiopulmonary Exercise Testing (CPET)
- Exhaled nitric oxide test
Cancer diagnostic procedures
Consultations
Counseling & prevention
Critical care
Diagnostic procedures
Drainage care
Imaging
Interventional procedures
Lab tests
Lung tests
Medications
Monitoring
Procedures
Rehabilitation
Screening
Sleep equipment
Sleep treatments
Specialist evaluations
Specialized testing
Procedures Most Often Billed to Medicare
5,736 services · 3,411 patients · 25 distinct codes
| Procedure | Type | Code | Services | Compared with peers |
|---|---|---|---|---|
| Evaluation of use of breathing device | Treatment | 94664 |
399 | More than most peers in Pulmonary Disease |
| Test to examine how well the lungs exchange gases | Treatment | 94729 |
314 | More than most peers in Pulmonary Disease |
| Test to determine lung volumes using gas dilution or washout | Treatment | 94727 |
287 | More than most peers in Pulmonary Disease |
| Test to measure rate of airflow | Treatment | 94375 |
283 | More often than most peers in Pulmonary Disease |
| Test to measure expiratory airflow and volume changes before and after medication administration | Treatment | 94060 |
258 | More than most peers in Pulmonary Disease |
| Test to measure expiratory airflow and volume | Treatment | 94010 |
232 | More often than most peers in Pulmonary Disease |
| Test for exercise-induced lung stress | Treatment | 94618 |
183 | More than most peers in Pulmonary Disease |
| Test to measure the level of nitric oxide gas | Treatment | 95012 |
178 | More than most peers in Pulmonary Disease |
| Sleep study including heart rate, breathing, airflow, and effort | Treatment | 95806 |
42 | As often as other peers in Pulmonary Disease |
| Test to determine lung volumes using sensors | Treatment | 94726 |
27 | Less often than most peers in Pulmonary Disease |
Source: CMS Medicare public data. Shows how often procedures were billed — not quality of care or patient satisfaction.
Related providers
Connections drawn from the registry and from what providers have told us. A link here is not a referral or an endorsement.
Other lung specialists at this location 7
Same specialty, same street address — most likely the same department or group.
Also at this address 4
Providers at the same street address. Each files their own registry entry, so a shared practice often appears under several different names.
More connections — 24 related providers in 3 groups
Trained at Michigan State University College of Osteopathic Medicine 8
Other providers in the same specialty who trained at the same institution.
Class of 2000 at Michigan State University College of Osteopathic Medicine 8
Providers who graduated from the same medical school in the same year.
Also performs Evaluation of use of breathing device 8
Providers in CA who bill this service to Medicare most often.
Common questions
What kind of doctor is William W. Chang?
William W. Chang is a lung specialist in San Juan Capistrano, CA. That is the designation recorded for this NPI in the federal registry, where it is listed as “Pulmonary Disease”.
NPI registry
What is William W. Chang's address?
William W. Chang is listed at 30230 Rancho Viejo Rd Suite 200, San Juan Capistrano, CA 92675. Addresses come from the NPI registry and can lag a move, so confirm before travelling.
NPI registry
How can I make an appointment with William W. Chang?
The number on file is (714) 571-5000. Contact the office directly to confirm availability and scheduling.
NPI registry
What is the NPI for William W. Chang?
William W. Chang's National Provider Identifier is 1417902149. It is issued by the Centers for Medicare & Medicaid Services and is unique and permanent — it does not change if they move practice.
NPI registry
Where did William W. Chang train?
William W. Chang attended Michigan State University College of Osteopathic Medicine, graduating in 2000. This comes from the CMS National Downloadable File.
CMS public data
How much experience does William W. Chang have?
William W. Chang has 26 years experience. Calculated from a graduation year of 2000, reported in the CMS National Downloadable File.
CMS public data
What procedures does William W. Chang perform?
According to Medicare billing data, William W. Chang provides treatments such as evaluation of use of breathing device and test to examine how well the lungs exchange gases, alongside routine visits and testing. This reflects Medicare patients only and is billing volume, not a measure of quality.
Medicare claims
Is William W. Chang's profile verified?
Not yet. This profile is built from public federal data and has not been confirmed by William W. Chang. If this is you, claiming it is free.
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