Active NPI 1225079593 Individual Practitioner Male Practitioner

Dr. Mark Douglas Duncan , MD

Surgery • Baltimore, MD

Telehealth Available

Professional Overview & Biography Verified Profile Summary

Dr. Mark Duncan, MD is a certified Surgery practicing in Baltimore, MD. With approximately 39 years of clinical experience since graduating from Mayo Medical School in 1987, Dr. Duncan delivers high-quality medical care to the local community at 4940 EASTERN AVE.

Dr. Duncan is affiliated with Johns Hopkins University and does not directly accept Medicare assignment . Telehealth and virtual consultation options are available for eligible patients.

Frequently performed procedures and clinical services include established patient outpatient office visit, new patient outpatient office visit, removal of gallbladder using an endoscope. Full Medicare procedure pricing transparency rates and service volume details are listed on this profile.

Practice Location & Contact Primary Location

Practice Address

4940 Eastern Ave

Baltimore, MD 212242735

Telephone 4105500400

Associated Practice Facility / Clinic

🏢 Johns Hopkins University Facility NPI 1922008549

Medicare Profile & Education

Medical School

Mayo Medical School

Graduation Year

1987

Medicare Assignment

Not Specified

Telehealth Flag

Telehealth Services Available

Specialty Benchmarks & Practice Insights

Comparative analytics for Surgery in Baltimore, MD

Senior Veteran Specialist (>20 Yrs)

Practitioner Clinical Experience

39 Yrs +16.2 yrs vs City Avg

City Avg: 22.8 Yrs

State Avg: 28.6 Yrs

Regional Practice Density

266 Specialists

Practicing in Baltimore, MD (717 Statewide)

Telehealth Adoption Rate

12.0% Regional Adoption

✓ Offers Virtual Consultations

Medicare Pricing Discount

67.8% Avg Savings

Under CMS Medicare Fee Schedule vs Standard Submitted Charges

Clinical Seniority & Experience Comparison

Dr. Duncan (39 Years) 39 Yrs

Baltimore Specialty Average (22.8 Years) 22.8 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
99214 Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more	44	34	$313.00	$98.10
99204 New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more	26	26	$408.00	$136.77
99205 New patient office or other outpatient visit with a high level of medical decision making, if using time, 60 minutes or more	23	23	$601.00	$185.99
99215 Established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more	22	19	$421.00	$147.39
47562 Removal of gallbladder using an endoscope	14	14	$2134.93	$681.33

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
99213 Established patient office or other outpatient visit, typically 15 minutes	29	26	$195.17	$69.96
99214 Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more	28	22	$298.00	$100.26
99204 New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more	25	25	$408.00	$141.65
47562 Removal of gallbladder using an endoscope	19	19	$2133.00	$707.53
99215 Established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more	18	17	$399.06	$151.69
99203 New patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more	15	15	$314.60	$88.32
99205 New patient office or other outpatient visit with a high level of medical decision making, if using time, 60 minutes or more	13	13	$583.00	$192.40

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
99214 Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more	25	25	$243.00	$101.60
47562 Removal of gallbladder using an endoscope	23	23	$2156.18	$643.55
99203 New patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more	19	19	$239.00	$89.81
99204 New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more	16	16	$408.00	$144.80
99213 Established patient office or other outpatient visit, typically 15 minutes	14	11	$158.00	$71.25

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
47562 Removal of gallbladder using an endoscope	17	17	$2133.00	$685.81
99213 Established patient office or other outpatient visit, typically 15 minutes	16	14	$158.00	$72.92
99205 New patient office or other outpatient visit with a high level of medical decision making, if using time, 60 minutes or more	16	16	$523.00	$180.47
99203 New patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more	15	15	$239.00	$91.00
99214 Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more	14	13	$243.00	$107.86
99204 New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more	11	11	$408.00	$136.44

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
99213 Established patient office or other outpatient visit, typically 15 minutes	15	15	$171.47	$56.14
99202 New patient office or other outpatient visit, typically 20 minutes	11	11	$156.00	$54.25

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
99214 Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more	30	28	$243.00	$84.34
99213 Established patient office or other outpatient visit, typically 15 minutes	24	22	$158.00	$54.74
99202 New patient office or other outpatient visit, typically 20 minutes	13	13	$156.00	$54.54
99204 New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more	13	13	$408.00	$131.51
99203 New patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more	11	11	$239.00	$82.08

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
99214 Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more	56	44	$243.00	$83.05
99213 Established patient office or other outpatient visit, typically 15 minutes	26	24	$158.00	$54.44
99204 New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more	23	23	$413.43	$133.49
99215 Established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more	20	17	$342.00	$117.48
99203 New patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more	12	12	$239.00	$81.83

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
99213 Established patient office or other outpatient visit, typically 15 minutes	50	44	$158.00	$53.71
99214 Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more	48	38	$243.00	$81.62
99215 Established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more	19	18	$342.00	$112.76
99203 New patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more	18	18	$239.00	$81.15
99204 New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more	15	15	$408.00	$136.88
99202 New patient office or other outpatient visit, typically 20 minutes	14	14	$156.00	$53.35
99212 Established patient office or other outpatient visit with straightforward medical decision making, if using time, 10 minutes or more	12	11	$78.00	$26.87

Medical Specialties & State Licenses

Surgery Primary Specialty

NUCC Taxonomy Code: 208600000X

State License MD D51208

A general surgeon has expertise related to the diagnosis - preoperative, operative and postoperative management - and management of complications of surgical conditions in the following areas: alimentary tract; abdomen; breast, skin and soft tissue; endocrine system; head and neck surgery; pediatric surgery; surgical critical care; surgical oncology; trauma and burns; and vascular surgery. General surgeons increasingly provide care through the use of minimally invasive and endoscopic techniques. Many general surgeons also possess expertise in transplantation surgery, plastic surgery and cardiothoracic surgery.

Additional State Medicaid & Healthcare Payer Identifiers

Medicaid State Provider ID

530900000 (MD)

Hospital & Practice Group Affiliations

Johns Hopkins University

4940 Eastern Ave, Baltimore, MD 212242735

Phone: 4105500100

Practice Associates & Co-Workers

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

14 Associated Practitioners

Dr. Stephen Milner , MD

Surgery

NPI 1033169578

Doctor of Medicine (M.D.)

Dr. Lisa Jacobs , MD

Surgery - Surgical Oncology

NPI 1063451714

Doctor of Medicine (M.D.)

Dr. Kimberley Steele , MD

Surgery

NPI 1104856871

Doctor of Medicine (M.D.)

Patricia Jordan , CRNP

Nurse Practitioner

NPI 1144261777

Certified Registered Nurse Practitioner

Michael Cooley , CRNP

Nurse Practitioner

NPI 1235178369

Certified Registered Nurse Practitioner

Linda Bartock , CRNP

Registered Nurse

NPI 1265449052

Certified Registered Nurse Practitioner

Career & Practice History Timeline

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

6 Historical Events

✅

NPI Profile Active February 06, 2013

NPI status registered as active in NPPES database

📍

Updated Practice Location February 06, 2013

Registered at 4940 EASTERN AVE, BALTIMORE, MD 212242735 (Tel: 4105500400)

📍

Updated Business Mailing Address February 06, 2013

Registered at PO BOX 64563, BALTIMORE, MD 212644563 (Tel: 4105501226)

👤

Provider Name / Credentials Updated February 06, 2013

Recorded as MARK DUNCAN, M.D.

🎓

Medical Taxonomy / Specialty Registered (Primary Specialty) February 06, 2013

Surgery (License #D51208 in MD)

🟢

Initial NPI Registration & Enumeration June 09, 2006

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: 1225079593

Entity Type:

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

Enumeration Date: June 09, 2006

Last Update: February 06, 2013

Sole Proprietor: No

Update or Correct Profile

Mailing Address

Po Box 64563

Baltimore, MD 212644563

Phone: 4105501226

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.