Active NPI 1407057920 Individual Practitioner Male Practitioner

Dr. Warren Andrew Chang , MD

Internal Medicine • Abingdon, VA

✓ Accepts Medicare Assignment

Professional Overview & Biography Verified Profile Summary

Dr. Warren Chang, MD is a certified Internal Medicine practicing in Abingdon, VA. With approximately 34 years of clinical experience since completing medical education in 1992, Dr. Chang delivers high-quality medical care to the local community at 16000 JOHNSTON MEMORIAL DR.

Dr. Chang is affiliated with Catawba Valley Medical Center and accepts Medicare assignment.

Frequently performed procedures and clinical services include subsequent hospital care with moderate levelof medical decision making, if using time, at least, hospital discharge day management, more than, initial hospital care with moderate level of medical decision making, if using time, at least. Full Medicare procedure pricing transparency rates and service volume details are listed on this profile.

Practice Location & Contact Primary Location

Practice Address

16000 Johnston Memorial Dr
Fourth Floor

Abingdon, VA 242117664

Telephone 2762584050

Fax 2762584056

Associated Practice Facility / Clinic

🏢 Johnston Memorial Hospital, Inc Facility NPI 1104812684

Medicare Profile & Education

Medical School

Other

Graduation Year

1992

Medicare Assignment

✓ Accepts Assignment

Telehealth Flag

In-Person Only

Specialty Benchmarks & Practice Insights

Comparative analytics for Internal Medicine in Abingdon, VA

Senior Veteran Specialist (>20 Yrs)

Practitioner Clinical Experience

34 Yrs +13.9 yrs vs City Avg

City Avg: 20.1 Yrs

State Avg: 26.1 Yrs

Regional Practice Density

36 Specialists

Practicing in Abingdon, VA (3758 Statewide)

Telehealth Adoption Rate

11.1% Regional Adoption

In-Person Office Visits Only

Medicare Pricing Discount

52.0% Avg Savings

Under CMS Medicare Fee Schedule vs Standard Submitted Charges

Clinical Seniority & Experience Comparison

Dr. Chang (34 Years) 34 Yrs

Abingdon Specialty Average (20.1 Years) 20.1 Yrs

Performed Procedures & Service Volume

Top Medicare Part B procedures performed by this practitioner

CMS Official Data (2024)

Reporting Year:

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
99233 Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes	272	97	$201.00	$110.45
99232 Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes	146	67	$141.00	$73.46
99239 Hospital discharge day management, more than 30 minutes	107	106	$208.00	$106.64
99223 Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes	104	103	$383.00	$161.56
99222 Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes	11	11	$262.00	$121.48

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
99233 Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes	347	110	$201.00	$113.55
99232 Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes	133	65	$141.00	$74.61
99239 Hospital discharge day management, more than 30 minutes	96	92	$208.00	$108.97
99223 Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes	95	94	$383.00	$164.61
99291 Critical care, first 30-74 minutes	13	13	$477.00	$203.41

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
99233 Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes	393	111	$201.00	$97.59
99232 Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes	152	69	$141.00	$68.53
99223 Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes	99	96	$383.00	$189.46
99239 Hospital discharge day management, more than 30 minutes	86	82	$208.00	$100.86

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
99233 Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes	438	126	$201.00	$101.42
99232 Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes	253	111	$141.00	$70.58
99239 Hospital discharge day management, more than 30 minutes	108	105	$208.00	$104.15
99223 Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes	102	101	$383.00	$196.51
99238 Hospital discharge day management, 30 minutes or less	28	28	$144.00	$70.67
99220 Hospital observation care, typically 70 minutes	21	21	$318.00	$178.53
99221 Initial hospital inpatient care per day, typically 30 minutes	17	17	$188.00	$95.19
99217 Hospital observation care on day of discharge	14	14	$145.00	$70.65
99291 Critical care, first 30-74 minutes	13	13	$477.00	$217.07

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
99233 Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes	397	106	$201.00	$102.66
99232 Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes	213	95	$141.00	$71.13
99223 Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes	104	102	$383.00	$198.77
99238 Hospital discharge day management, 30 minutes or less	64	64	$144.00	$71.64
99239 Hospital discharge day management, more than 30 minutes	41	40	$208.00	$104.82
99291 Critical care, first 30-74 minutes	25	19	$477.00	$218.61
99220 Hospital observation care, typically 70 minutes	20	20	$318.00	$181.81
99222 Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes	13	13	$262.00	$135.23
99217 Hospital observation care on day of discharge	12	12	$145.00	$65.28

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
99232 Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes	331	146	$141.00	$69.46
99233 Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes	281	99	$201.00	$99.46
99223 Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes	129	126	$383.00	$195.58
99239 Hospital discharge day management, more than 30 minutes	83	82	$208.00	$102.18
99291 Critical care, first 30-74 minutes	76	39	$477.00	$215.31
99238 Hospital discharge day management, 30 minutes or less	64	64	$144.00	$70.45
99222 Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes	17	17	$262.00	$132.18
99220 Hospital observation care, typically 70 minutes	15	15	$318.00	$169.32
99221 Initial hospital inpatient care per day, typically 30 minutes	14	14	$188.00	$97.61
99219 Hospital observation care, typically 50 minutes	12	12	$226.00	$131.50

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
99232 Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes	312	135	$141.00	$68.67
99233 Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes	287	113	$201.00	$99.82
99291 Critical care, first 30-74 minutes	119	70	$477.00	$214.11
99223 Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes	96	96	$383.00	$192.80
99239 Hospital discharge day management, more than 30 minutes	75	74	$208.00	$101.41
99238 Hospital discharge day management, 30 minutes or less	49	49	$144.00	$69.53
99220 Hospital observation care, typically 70 minutes	16	16	$318.00	$180.46
99217 Hospital observation care on day of discharge	15	15	$145.00	$70.59

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
99232 Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes	347	169	$141.00	$67.62
99233 Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes	143	64	$201.00	$97.70
99223 Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes	101	99	$383.00	$185.08
99291 Critical care, first 30-74 minutes	89	40	$477.00	$209.13
99239 Hospital discharge day management, more than 30 minutes	77	76	$208.00	$100.47
99238 Hospital discharge day management, 30 minutes or less	48	48	$144.00	$67.73
99222 Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes	32	32	$262.00	$128.40
99220 Hospital observation care, typically 70 minutes	23	23	$318.00	$167.07
99217 Hospital observation care on day of discharge	22	22	$145.00	$64.98
99225 Subsequent observation care, typically 25 minutes per day	16	13	$145.00	$68.24
99219 Hospital observation care, typically 50 minutes	14	14	$226.00	$119.41

Medical Specialties & State Licenses

Internal Medicine Primary Specialty

NUCC Taxonomy Code: 207R00000X

State License VA 0101241447

A physician who provides long-term, comprehensive care in the office and the hospital, managing both common and complex illness of adolescents, adults and the elderly. Internists are trained in the diagnosis and treatment of cancer, infections and diseases affecting the heart, blood, kidneys, joints and digestive, respiratory and vascular systems. They are also trained in the essentials of primary care internal medicine, which incorporates an understanding of disease prevention, wellness, substance abuse, mental health and effective treatment of common problems of the eyes, ears, skin, nervous system and reproductive organs.

Additional State Medicaid & Healthcare Payer Identifiers

Medicaid State Provider ID

1407057920 (VA)

Hospital & Practice Group Affiliations

Catawba Valley Medical Center

810 Fairgrove Church Rd, Hickory, NC 286029617

Phone: 8283263000

Catawba Valley Medical Center

810 Fairgrove Church Rd Se, Hickory, NC 286029617

Phone: 8283263000

Practice Associates & Co-Workers

Healthcare professionals and specialists practicing at this location or sharing practice phone/fax

13 Associated Practitioners

Dr. Joe Rupe , MD

Internal Medicine

NPI 1013986264

Doctor of Medicine (M.D.)

Dr. Shyam Sundhar Odeti , MD

Family Medicine

NPI 1154614816

Doctor of Medicine (M.D.)

Dr. Damian Sooklal , MD

Hospitalist

NPI 1356338495

Doctor of Medicine (M.D.)

Dr. Brian Stiltner , DO

Internal Medicine

NPI 1356638076

Doctor of Osteopathic Medicine (D.O.)

Afton Cope , FNP-BC

Nurse Practitioner - Family

NPI 1396275558

Family Nurse Practitioner (Board Certified)

Dr. Elizabeth Turner , MD

Pediatrics

NPI 1487793477

Doctor of Medicine (M.D.)

Career & Practice History Timeline

Chronological log of verified NPI updates, location relocations, credentials, and registry changes

6 Historical Events

✅

NPI Profile Active March 22, 2016

NPI status registered as active in NPPES database

📍

Updated Practice Location March 22, 2016

Registered at 16000 JOHNSTON MEMORIAL DR, FOURTH FLOOR, ABINGDON, VA 242117664 (Tel: 2762584050)

📍

Updated Business Mailing Address March 22, 2016

Registered at PO BOX 3700, JOHNSON CITY, TN 376023700 (Tel: 4233021350)

👤

Provider Name / Credentials Updated March 22, 2016

Recorded as WARREN CHANG, M.D.

🎓

Medical Taxonomy / Specialty Registered (Primary Specialty) March 22, 2016

Internal Medicine (License #0101241447 in VA)

🟢

Initial NPI Registration & Enumeration May 31, 2007

First registered as active Individual Practitioner in NPPES Database.

Patient & Community Reviews

Verified patient ratings, medical care experiences, and facility photos

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NPI Administrative Meta

NPI Number: 1407057920

Entity Type:

Individual Provider Physician, Nurse Practitioner, or Solo Healthcare Professional (Type 1 NPI)

Enumeration Date: May 31, 2007

Last Update: March 22, 2016

Sole Proprietor: No

Update or Correct Profile

Mailing Address

Po Box 3700

Johnson City, TN 376023700

Phone: 4233021350

Public Domain Record This profile contains public domain information published by CMS and NPPES under the Freedom of Information Act (FOIA).

⚠️ Medical Disclaimer

This directory listing is for informational purposes only and does not constitute medical advice, diagnosis, or physician endorsement. If you are experiencing a medical emergency, please call 911 immediately.