Dr. Warren Andrew Chang, MD
- Medicare services, 2024
- 640
- Medicare patients, 2024
- 236
- Part D claims, 2024
- 264
- Hospital affiliations
- 1
- Industry payments
- $961
- Practice address
- 810 Fairgrove Church Rd, Hickory, NC 28602
- Practice phone
- Call (828) 326-3809
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Find Dr. Chang's professional email, personal email and mobile number
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Dr. Warren Andrew Chang is an internist in Hickory, North Carolina
Dr. Chang practices at Catawba Valley Medical Center in Hickory, North Carolina, part of Catawba Valley Health System.
Dr. Chang's NPI, 1407057920, was assigned on May 31, 2007. Dr. Chang holds Virginia license 0101241447.
- NPI
- 1407057920NPI Registry (opens in a new tab)
- Medicare PAC ID
- 3971688201
- NPI enumeration date
- May 31, 2007
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (828) 326-3809
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 60
- Medical school graduation
- 1992
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Warren Andrew Chang practices at Catawba Valley Medical Center in Hickory, North Carolina
Dr. Chang's primary practice is Catawba Valley Medical Center, at 810 Fairgrove Church Rd, Hickory, NC 28602 in Catawba County. The practice phone is (828) 326-3809.
- Catawba Valley Medical Center810 Fairgrove Church Rd, Hickory, NC 28602 · Catawba CountyPhone(828) 326-3809
Source: Dmand AI Affiliation Data
Dr. Warren Andrew Chang is affiliated with 1 site of care and 1 medical group
Dr. Chang's primary practice is Catawba Valley Medical Center in Hickory, North Carolina, part of Catawba Valley Health System. The medical group on file is Catawba Valley Medical Center.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Warren Andrew Chang's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Chang practices. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Catawba Valley Medical Center | Available with a free account |
Source: Dmand AI Technology Install Data
For health IT teams
Dmand AI maps EHR vendors, IT decision makers and buying committees across Catawba Valley Health System and 6.2K+ hospitals, with verified contacts in the same login.
Dr. Warren Andrew Chang is one of 3,705 internists in North Carolina
Internal medicine is Dr. Chang's primary specialty in the NPI Registry, under taxonomy code 207R00000X. Dr. Chang is licensed in Virginia.
Specialties and state licenses
- Internal medicine, VirginiaPrimary
Internists near Dr. Chang
Counts of internists with a Dmand AI profile, by place and practice. Each opens the list.
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Dr. Warren Andrew Chang billed Medicare for 640 services in 2024
CMS data shows 640 Medicare services from Dr. Chang across 5 procedure codes in 2024, for 236 Medicare patients. Medicare paid $55,392 for them. Every service was in a facility, such as a hospital, rather than an office.
Dr. Chang's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 6842024: 6406%
Dr. Chang compared with the North Carolina median for internists, 2024
- Dr. Chang
- North Carolina median
- Medicare services
- 640vs 52123% above
- Medicare patients
- 236vs 18528% above
- Part D claims
- 71vs 27274% below
Medians across 3,695 internists in North Carolina with Dmand AI profiles that report each measure.
Dr. Chang's most billed Medicare procedure codes, 2024
CMS publishes codes billed for 11 or more Medicare patients. Each label is the code family; CPT descriptions are licensed by the AMA.
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Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Chang and other internists in North Carolina.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Warren Andrew Chang treated 236 Medicare patients in 2024, average age 76
CMS counts 236 Medicare patients who saw Dr. Chang in 2024. The largest group is 65 to 74, with 78 patients. 75% of them have high blood pressure, and 75% have high cholesterol. 25% are also on Medicaid. Their average risk score is 2.21, where 1.00 is the Medicare average, so they are sicker than most Medicare patients.
Across all payers, Dmand AI patient panel data puts Dr. Chang's median patient age at 75, with 58% women.
Dr. Chang's Medicare patients by age, 2024
Dr. Chang's Medicare patients by sex, 2024
- Women13356%
- Men10344%
Chronic conditions among Dr. Chang's Medicare patients, 2024
- High blood pressure75%
- High cholesterol75%
- Arthritis67%
- Anxiety52%
- Diabetes50%
- Mood disorders48%
- Depression46%
- Chronic kidney disease44%
Share of Medicare patients with each condition. A patient can have several.
Dr. Chang's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 75
Patient panel by sex, all payers
- Women58%
- Men41%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Warren Andrew Chang wrote 264 Medicare Part D claims in 2024
In 2024, Dr. Chang wrote 264 Medicare Part D claims for 111 patients. 81% of them were for generic drugs. CMS names the drug for 71 of them, across 4 drugs with 11 or more claims each, at $674 in total drug cost. In 2023, CMS named 39 claims across 3 drugs.
Dr. Chang's Part D claims by kind of drug, 2024
- Generic213 claims81%
- Brand-name and other51 claims19%
Dr. Chang's most prescribed drugs by claims, 2024
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Drug classes CMS tracks in Dr. Chang's Part D claims, 2024
- Antibiotics23%61 of 264 claims
Share of all Part D claims for each drug class CMS reports on. Classes with no claims are left out.
Part D claims for drugs CMS names, 2023 to 2024
- 2023
- 2024
- Claims for drugs CMS names
- 2023: 392024: 7182%
Drugs named by CMS: 4 in 2024, 3 in 2023.
Sources: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026; and Medicare Part D Prescribers - by Provider (CMS), 2024 data
How Dr. Warren Andrew Chang takes part in Medicare
Dr. Chang accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
Source: Doctors and Clinicians National Downloadable File (CMS)
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Dr. Warren Andrew Chang received $961 in industry payments from 2016 to 2025
CMS Open Payments shows 48 general payments to Dr. Chang from 17 drug and device companies from 2016 to 2025. Food and beverage make up the largest share, 99% of the total. Novo Nordisk Inc paid the most, $138.
General payments to Dr. Chang by program year, 2016 to 2025
General payments to Dr. Chang by kind, 2016 to 2025
- Food and beverage$95199%
- Education$101%
Companies that paid Dr. Chang the most, 2016 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Sources for Dr. Warren Andrew Chang's profile data
| Data on this page | Source |
|---|---|
| NPI, name, sex, specialty and licenses | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data |
| Practice locations and phone | Dmand AI Affiliation Data |
| Primary practice, affiliations and health system | Dmand AI Affiliation DataDmand AI Org Hierarchy Data |
| Medicare services and procedure codes | Medicare Physician & Other Practitioners - by Provider and Service (CMS) (opens in a new tab) |
| State medians for the same specialty | Dmand AI Peer Benchmarks |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel DataMedicare Physician & Other Practitioners - by Provider (CMS) (opens in a new tab) |
| Part D prescribing | Medicare Part D Prescribers - by Provider and Drug (CMS) (opens in a new tab)Medicare Part D Prescribers - by Provider (CMS) (opens in a new tab) |
| MIPS scores, telehealth, assignment and procedure percentiles | Doctors and Clinicians National Downloadable File (CMS) (opens in a new tab) |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| EHR at each practice site | Dmand AI Technology Install Data |
| Similar physicians | Dmand AI Affiliation Data |
Data last refreshed October 2026Report an inaccuracyRemove my information
FAQ
Frequently asked questions about Dr. Warren Andrew Chang
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Dr. Warren Andrew Chang's NPI number?
Dr. Warren Andrew Chang's NPI number is 1407057920. It was assigned on May 31, 2007, and it is active in the NPI Registry.
What kind of doctor is Dr. Warren Andrew Chang?
Dr. Warren Andrew Chang is an internist in Hickory, North Carolina. The primary specialty in the NPI Registry is Internal Medicine Physician (taxonomy code 207R00000X).
Where does Dr. Warren Andrew Chang practice?
Dr. Chang practices at 810 Fairgrove Church Rd, Hickory, NC 28602. Dr. Chang's primary practice is Catawba Valley Medical Center in Hickory, North Carolina, part of Catawba Valley Health System.
What is Dr. Warren Andrew Chang's office phone number?
The practice phone on file for Dr. Chang is (828) 326-3809.
What is Dr. Warren Andrew Chang's medical license number?
Dr. Chang holds Virginia license 0101241447.
Which hospitals is Dr. Warren Andrew Chang affiliated with?
Dr. Chang practices at Catawba Valley Medical Center in Hickory, North Carolina.
What medical group is Dr. Warren Andrew Chang part of?
Dr. Chang is linked to Catawba Valley Medical Center.
Does Dr. Warren Andrew Chang accept Medicare?
Yes. CMS data shows Dr. Chang billed Medicare for 640 services in 2024, and Dr. Chang accepts Medicare assignment.
How many Medicare patients does Dr. Warren Andrew Chang see?
CMS counts 236 Medicare patients who saw Dr. Chang in 2024, with an average age of 76.
What services does Dr. Warren Andrew Chang bill to Medicare?
In 2024, Dr. Chang's most billed Medicare services were hospital inpatient care (99233), hospital inpatient care (99232) and hospital inpatient care (99239).
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What drugs does Dr. Warren Andrew Chang prescribe most?
In 2024 Medicare Part D data, Dr. Chang's most prescribed drugs by claims were Prednisone, Amoxicillin-Clavulanate Potass and Doxycycline Hyclate.
Has Dr. Warren Andrew Chang received payments from drug or device companies?
CMS Open Payments shows $961 in general payments to Dr. Chang from 17 companies from 2016 to 2025. The largest total came from Novo Nordisk Inc.
How long has Dr. Warren Andrew Chang been practicing?
Dr. Chang graduated from medical school in 1992, 34 years ago.
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