Physician Profile
William W. Chang, D.O.
Unclaimed ProfileAbout 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.
Summarised automatically from public NPI registry and CMS Medicare data. Not written or reviewed by this provider. Claim this profile to replace it.
Education & Training
Specialty
Credentials & Licensing
License numbers are what the provider reported to NPPES when the NPI was issued or updated. NPPES does not verify licensure; confirm current standing with the state licensing board.
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
Most searched conditions
- Asthma
- Chronic cough
- COPD
- Lung cancer
- Pulmonary fibrosis
- Shortness of breath
- Sleep apnea
Airway disorders
- Acute bronchitis
- Bronchiectasis
- Chronic Throat Clearing and Chronic Cough
Blood vessel disorders
- Blood Clot in Lung
- Pulmonary hypertension
Critical care
- Respiratory failure
Diagnostic findings
- Swollen Chest Lymph Nodes
Environmental lung diseases
- Chronic Beryllium Disease
Genetic conditions
- Alpha-1 antitrypsin deficiency
- Cystic fibrosis in adults
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
- Farmer's lung
- Interstitial lung disease
- Sarcoidosis
Lung growths
- Mesothelioma
- Suspicious Lung Spot
Occupational & environmental
- Asbestos lung damage
- Black lung disease
- Silicosis
- Vaping lung illness
Pleural disorders
- Collapsed lung
- Fluid around the lungs
- Pain when breathing
Post-infection conditions
- Long COVID lung problems
Sleep disorders
- Excessive daytime sleepiness
- Shallow Breathing In Sleep
- Snoring
- Upper Airway Resistance Syndrome
- Waking Up Gasping Or Choking
Structural lung conditions
- Lung Bullae
Symptoms
- Blue Baby Syndrome
- Chest congestion
- Coughing up blood
- Low oxygen levels
- Rapid Breathing
- Severe asthma attack
- Wheezing
Procedures & services
Most searched procedures
- Bronchoscopy
- Oxygen therapy management
- Pulmonary function test
- Spirometry
Airway care
- Trach Tube Care and Changing
Airway management
- Tracheostomy care
Biopsies
- Lung Cryobiopsy
Biopsies & diagnostics
- EBUS lung biopsy
- Needle biopsy of lung
- Robotic lung biopsy
Breathing tests
- 6-minute walk test
- Asthma challenge test
- Cardiopulmonary Exercise Testing (CPET)
- Exhaled nitric oxide test
Cancer diagnostic procedures
- Endobronchial Ultrasound Staging
Consultations
- Pre-op lung clearance
Counseling & prevention
- Inhaler technique instruction
- Smoking cessation counseling
Critical care
- Ventilator Weaning Evaluation
Diagnostic procedures
- Lung Wash Procedure
Drainage care
- Pleural Catheter Removal
Imaging
- Chest CT Scan
- Chest X-Ray
- Lung Perfusion Scan
Interventional procedures
- Bronchial thermoplasty
- Lung valve placement for emphysema
Lab tests
- Arterial blood gas test
- Sputum test
Lung tests
- Pre- And Post-Bronchodilator Test
Medications
- Severe Asthma Biologics
Monitoring
- Asthma Action Plan Consultation
- Continuous Pulse Oximetry
Pleural procedures
- Chest tube insertion
- Draining lung fluid
- Medical thoracoscopy
- Permanent chest drain insertion
- Pleural sealing procedure
Procedures
- Foreign Object Removal From Airway
- Windpipe stent placement
Rehabilitation
- Airway clearance therapy
- Pulmonary rehabilitation
Screening
- Low-dose CT lung cancer screening
Sleep equipment
- CPAP Mask Fitting
Sleep medicine
- At-home sleep test
- BiPAP therapy
- CPAP titration
- Overnight oxygen study
- Sleep study
Sleep treatments
- Sleep Apnea Dental Device Evaluation
Specialist evaluations
- Lung Transplant Evaluation
- Lung Volume Reduction Evaluation
Specialized testing
- High-Altitude Oxygen Test
Treatments
- Breathing Treatment
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 |
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. Guide.md cannot book appointments or pass on messages — please call the office directly.
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.
Guide.md
Provider data sourced from the NPPES NPI Registry and CMS public datasets. Information is provided for reference and is not medical advice.