Active NPI 1578501797 Individual Practitioner Male Practitioner

Dr. Mark D Johnson , MD PHD

Neurological Surgery • Worcester, MA

✓ Accepts Medicare Assignment Telehealth Available

Professional Overview & Biography Verified Profile Summary

Dr. Mark Johnson, MD PHD is a certified Neurological Surgery practicing in Worcester, MA. With approximately 31 years of clinical experience since graduating from Harvard Medical School in 1995, Dr. Johnson delivers high-quality medical care to the local community at 55 LAKE AVE N.

Dr. Johnson is affiliated with Umass Memorial Medical Group Inc and accepts 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, computer-assisted procedure inside brain. Full Medicare procedure pricing transparency rates and service volume details are listed on this profile.

Practice Location & Contact Primary Location

Practice Address

55 Lake Ave N

Worcester, MA 016550002

Telephone 5088562963

Associated Practice Facility / Clinic

🏢 Umass Memorial Medical Center Facility NPI 1679574933

Medicare Profile & Education

Medical School

Harvard Medical School

Graduation Year

1995

Medicare Assignment

✓ Accepts Assignment

Telehealth Flag

Telehealth Services Available

Specialty Benchmarks & Practice Insights

Comparative analytics for Neurological Surgery in Worcester, MA

Senior Veteran Specialist (>20 Yrs)

Practitioner Clinical Experience

31 Yrs +9.2 yrs vs City Avg

City Avg: 21.8 Yrs

State Avg: 32.4 Yrs

Regional Practice Density

16 Specialists

Practicing in Worcester, MA (250 Statewide)

Telehealth Adoption Rate

56.2% Regional Adoption

✓ Offers Virtual Consultations

Medicare Pricing Discount

78.6% Avg Savings

Under CMS Medicare Fee Schedule vs Standard Submitted Charges

Clinical Seniority & Experience Comparison

Dr. Johnson (31 Years) 31 Yrs

Worcester Specialty Average (21.8 Years) 21.8 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	43	39	$445.00	$96.16
99213 Established patient office or other outpatient visit, typically 15 minutes	36	30	$300.00	$65.29
99215 Established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more	25	21	$625.32	$142.71
99204 New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more	21	21	$547.00	$131.94
61781 Computer-assisted procedure inside brain	13	13	$1178.00	$226.98
99203 New patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more	12	12	$359.00	$75.99

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
99213 Established patient office or other outpatient visit, typically 15 minutes	54	47	$279.26	$66.56
99214 Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more	47	36	$415.72	$98.30
99215 Established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more	19	17	$511.42	$144.40
99203 New patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more	11	11	$359.00	$83.46

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
99213 Established patient office or other outpatient visit, typically 15 minutes	92	74	$244.00	$68.05
99214 Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more	49	40	$359.00	$96.65
61781 Computer-assisted procedure inside brain	14	13	$1178.00	$237.40
99221 Initial hospital inpatient care per day, typically 30 minutes	11	11	$331.00	$94.89

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	81	57	$354.75	$100.40
99213 Established patient office or other outpatient visit, typically 15 minutes	61	53	$242.52	$67.88
62252 Reprogramming of programmable brain and spinal fluid shunt	28	15	$181.14	$43.88
99203 New patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more	16	16	$359.00	$86.49

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	95	65	$316.00	$83.75
99204 New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more	26	26	$489.00	$137.42
99213 Established patient office or other outpatient visit, typically 15 minutes	26	23	$214.00	$54.54
62252 Reprogramming of programmable brain and spinal fluid shunt	18	11	$175.00	$49.54
61781 Computer-assisted procedure inside brain	14	14	$1178.00	$241.08

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	93	67	$314.71	$81.18
99204 New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more	32	32	$488.38	$133.65
99215 Established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more	31	29	$428.71	$112.91
99213 Established patient office or other outpatient visit, typically 15 minutes	20	19	$210.25	$52.90
61781 Computer-assisted procedure inside brain	19	19	$1178.00	$256.04
62252 Reprogramming of programmable brain and spinal fluid shunt	16	12	$175.00	$49.79

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	118	90	$296.00	$81.46
99213 Established patient office or other outpatient visit, typically 15 minutes	40	38	$199.00	$52.76
99232 Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes	31	23	$210.00	$75.53
99204 New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more	29	29	$479.00	$134.46
99203 New patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more	28	28	$342.00	$78.13
99215 Established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more	17	14	$420.00	$115.25
62252 Reprogramming of programmable brain and spinal fluid shunt	15	12	$175.00	$49.84
61781 Computer-assisted procedure inside brain	11	11	$1178.00	$256.14

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	81	55	$296.00	$79.82
99213 Established patient office or other outpatient visit, typically 15 minutes	79	62	$199.00	$52.06
62252 Reprogramming of programmable brain and spinal fluid shunt	45	24	$175.00	$48.14
99204 New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more	35	35	$475.40	$132.47
99215 Established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more	22	20	$414.91	$113.67
99203 New patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more	18	18	$338.11	$78.50
99232 Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes	16	15	$208.63	$73.79
61781 Computer-assisted procedure inside brain	16	15	$1178.00	$244.06

Medical Specialties & State Licenses

CMS Verified: 2020-10-26

Neurological Surgery Primary Specialty

NUCC Taxonomy Code: 207T00000X

State License MA 217384

A neurological surgeon provides the operative and non-operative management (i.e., prevention, diagnosis, evaluation, treatment, critical care, and rehabilitation) of disorders of the central, peripheral, and autonomic nervous systems, including their supporting structures and vascular supply; the evaluation and treatment of pathological processes which modify function or activity of the nervous system; and the operative and non-operative management of pain. A neurological surgeon treats patients with disorders of the nervous system; disorders of the brain, meninges, skull, and their blood supply, including the extracranial carotid and vertebral arteries; disorders of the pituitary gland; disorders of the spinal cord, meninges, and vertebral column, including those which may require treatment by spinal fusion or instrumentation; and disorders of the cranial and spinal nerves throughout their distribution.

Hospital & Practice Group Affiliations

Umass Memorial Medical Group Inc

55 Lake Ave N, Worcester, MA 016550002

Phone: 5083341000

Practice Associates & Co-Workers

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

40 Associated Practitioners

Dr. Hillary Irons , MD

Emergency Medicine

NPI 1003041971

Doctor of Medicine (M.D.)

Eileen Duhamel , NP

Nurse Practitioner

NPI 1003054727

Nurse Practitioner

Ewa Hryniszyn , CRNA

Nurse Anesthetist, Certified Registered

NPI 1003056284

Certified Registered Nurse Anesthetist

Helen Copsey , PA-C

Physician Assistant

NPI 1003066804

Physician Assistant (Certified)

Dr. Adepeju Champion , MD

Internal Medicine

NPI 1003090499

Doctor of Medicine (M.D.)

Sowmya Korapati

Internal Medicine - Hematology & Oncology

NPI 1003108259

Career & Practice History Timeline

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

6 Historical Events

✅

NPI Profile Active September 30, 2016

NPI status registered as active in NPPES database

📍

Updated Practice Location September 30, 2016

Registered at 55 LAKE AVE N, WORCESTER, MA 016550002 (Tel: 5088562963)

📍

Updated Business Mailing Address September 30, 2016

Registered at PO BOX 415348, BOSTON, MA 022415348

👤

Provider Name / Credentials Updated September 30, 2016

Recorded as MARK JOHNSON, MD PHD

🎓

Medical Taxonomy / Specialty Registered (Primary Specialty) September 30, 2016

Neurological Surgery (License #217384 in MA)

🟢

Initial NPI Registration & Enumeration June 02, 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: 1578501797

Entity Type:

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

Enumeration Date: June 02, 2006

Last Update: October 26, 2020

Sole Proprietor: No

Update or Correct Profile

Mailing Address

Po Box 415348

Boston, MA 022415348

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.