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- 2006 N Riverside Ave Ste B, Rialto, CA 92377
About Dr. Chang
Karen Chang, DO is a healthcare provider in Rialto, CA specializing in gastroenterology. Karen trained at Lake Erie College of Osteopathic Medicine, Erie, graduating in 2016. Medicare claims data shows Karen provided 248 services to 207 patients. The services billed most often include subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes, use of a drug to induce depression of consciousness by physician performing a procedure (5 years or older), initial 15 minutes, and initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes. This provider record is associated with NPI 1861855439.
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
- (909) 644-4035
- Email not available
Is this your home address or personal number? Hide it
Practice Locations
2006 N RIVERSIDE AVE STE B
Rialto, CA 92377
Conditions Commonly Evaluated or Treated
Within Gastroenterology 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
Liver health
Specialized and cancer
- Short bowel syndrome
Wound care
- Feeding Tube Site Irritation
Most searched conditions
- Acid reflux
- Celiac disease
- Crohn's disease
- Hemorrhoids
- IBS
- Swallowing difficulties
- Ulcerative colitis
Biliary and pancreas
- Acute pancreatitis
- Gallstones
- Pancreatic cysts
- Primary sclerosing cholangitis
Colon and anorectal
- Anal fissure
- Colon cancer
- Colon polyps
- Lower gastrointestinal bleeding
Esophagus and swallowing
- Barrett's esophagus
- Eosinophilic esophagitis
- Esophageal stricture
- Esophagitis
Functional bowel and motility
- Chronic diarrhea
- Fecal incontinence
- Small intestinal bacterial overgrowth
Liver
- Ascites
- Autoimmune hepatitis
- Cirrhosis
- Fatty liver disease
- Hemochromatosis
- Hepatitis B
- Hepatitis C
- Portal hypertension
Stomach and duodenum
- Functional dyspepsia
- Gastritis
- Gastroparesis
- H. pylori infection
- Peptic ulcer disease
Bowel & Colon
Digestive Symptoms
Gallbladder & Bile Ducts
- Blocked Bile Duct
Procedures & services
Advanced endoscopy
- EUS-guided biopsy
Biliary and pancreatic endoscopy
- Biliary sphincterotomy
- Endoscopic bile duct stone removal
Capsule and physiology testing
- Ambulatory reflux monitoring
- Capsule endoscopy
- Hydrogen and methane breath testing
- Anorectal manometry
- Esophageal manometry
Chronic illness
- Feeding tube care and troubleshooting
Clinical Nutrition
Diagnostic Testing
- 24-Hour Acid Reflux Test
- H. Pylori Breath Test
- SIBO Breath Test
- EUS-Guided Fine Needle Biopsy
Digestive
- Bowel Retraining Program
General surgery
- Hemorrhoid banding and treatment
Infection & Microbiology Tests
Liver procedures
- Paracentesis
- Esophageal variceal banding
- Liver elastography
Lower endoscopy
- Colon polyp removal
- Diagnostic colonoscopy
- Endoscopic control of gastrointestinal bleeding
- Flexible sigmoidoscopy
Nursing care
- G-Tube Button Replacement
Nutrition & Digestion
- Feeding tube placement
Upper endoscopy
- Endoscopic mucosal resection
- Esophageal biopsy
- Esophageal dilation
- Stomach biopsy
- Endoscopic submucosal dissection
Most searched procedures
- Colonoscopy
- Endoscopy
- Gallbladder removal
- Hernia repair
- Liver biopsy
Treatments
- Stool Transplant
Procedures Most Often Billed to Medicare
248 services · 207 patients · 6 distinct codes
| Procedure | Type | Code | Services | Compared with peers |
|---|---|---|---|---|
| Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope | Procedure | 43239 |
23 | Less often than most peers in Gastroenterology |
| Diagnostic exam of large bowel using a flexible endoscope | Procedure | 45378 |
17 | As often as other peers in Gastroenterology |
| Use of a drug to induce depression of consciousness by physician performing a procedure (5 years or older), initial 15 minutes | Treatment | 99152 |
40 | As often as other peers in Gastroenterology |
| Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes | Office visit | 99233 |
116 | More often than most peers in Gastroenterology |
| Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes | Office visit | 99223 |
35 | As often as other peers in Gastroenterology |
| Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more | Office visit | 99214 |
17 | Less often than most peers in Gastroenterology |
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 gastroenterologists at this location 4
Same specialty, same street address — most likely the same department or group.
Related specialists at this location 1
Clinically related specialties at the same address — the people this provider most likely works alongside.
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 Lake Erie College of Osteopathic Medicine, Erie 8
Other providers in the same specialty who trained at the same institution.
Class of 2016 at Lake Erie College of Osteopathic Medicine, Erie 8
Providers who graduated from the same medical school in the same year.
Also performs Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope 8
Providers in CA who bill this service to Medicare most often.
Common questions
What kind of doctor is Dr. Chang?
Dr. Chang is a gastroenterologist in Rialto, CA. That is the designation recorded for this NPI in the federal registry, where it is listed as “Gastroenterology”.
NPI registry
What is Dr. Chang's address?
Dr. Chang is listed at 2006 N Riverside Ave Ste B, Rialto, CA 92377. Addresses come from the NPI registry and can lag a move, so confirm before travelling.
NPI registry
How can I make an appointment with Dr. Chang?
The number on file is (909) 644-4035. Contact the office directly to confirm availability and scheduling.
NPI registry
What is the NPI for Dr. Chang?
Dr. Chang's National Provider Identifier is 1861855439. 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 Dr. Chang train?
Dr. Chang attended Lake Erie College of Osteopathic Medicine, Erie, graduating in 2016. This comes from the CMS National Downloadable File.
CMS public data
How much experience does Dr. Chang have?
Dr. Chang has 10 years experience. Calculated from a graduation year of 2016, reported in the CMS National Downloadable File.
CMS public data
What procedures does Dr. Chang perform?
According to Medicare billing data, Dr. Chang performs procedures including biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope and diagnostic exam of large bowel using a flexible endoscope; provides treatments such as use of a drug to induce depression of consciousness by physician performing a procedure , initial 15 minutes, alongside routine visits and testing. This reflects Medicare patients only and is billing volume, not a measure of quality.
Medicare claims
Is Dr. Chang's profile verified?
Not yet. This profile is built from public federal data and has not been confirmed by Dr. Chang. If this is you, claiming it is free.
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Guide.md listings do not constitute medical advice or an endorsement.