Active NPI 1275620320 Individual Practitioner Male Practitioner

Dr. Thomas Dag Horn , MD

Dermatology • Boston, MA

✓ Accepts Medicare Assignment

Professional Overview & Biography Verified Profile Summary

Dr. Thomas Horn, MD is a certified Dermatology practicing in Boston, MA. With approximately 44 years of clinical experience since graduating from University Of Virginia School Of Medicine in 1982, Dr. Horn delivers high-quality medical care to the local community at 55 FRUIT ST.

Dr. Horn is affiliated with Massachusetts General Physicians Organization Inc and accepts Medicare assignment.

Frequently performed procedures and clinical services include pathology examination of tissue using a microscope, intermediate complexity, pathology examination of tissue using a microscope, moderately low complexity, special stained specimen slides to examine tissue, initial procedure. Full Medicare procedure pricing transparency rates and service volume details are listed on this profile.

Practice Location & Contact Primary Location

Practice Address

55 Fruit St

Boston, MA 021142621

Telephone 1766589300

Associated Practice Facility / Clinic

🏢 Massachusetts General Hospital Facility NPI 1184613721

Medicare Profile & Education

Medical School

University Of Virginia School Of Medicine

Graduation Year

1982

Medicare Assignment

✓ Accepts Assignment

Telehealth Flag

In-Person Only

Specialty Benchmarks & Practice Insights

Comparative analytics for Dermatology in Boston, MA

Senior Veteran Specialist (>20 Yrs)

Practitioner Clinical Experience

44 Yrs +27.6 yrs vs City Avg

City Avg: 16.4 Yrs

State Avg: 27.5 Yrs

Regional Practice Density

270 Specialists

Practicing in Boston, MA (648 Statewide)

Telehealth Adoption Rate

18.1% Regional Adoption

In-Person Office Visits Only

Medicare Pricing Discount

69.5% Avg Savings

Under CMS Medicare Fee Schedule vs Standard Submitted Charges

Clinical Seniority & Experience Comparison

Dr. Horn (44 Years) 44 Yrs

Boston Specialty Average (16.4 Years) 16.4 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
88305 Pathology examination of tissue using a microscope, intermediate complexity	712	474	$263.88	$79.98
88304 Pathology examination of tissue using a microscope, moderately low complexity	16	15	$150.00	$46.19

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
88305 Pathology examination of tissue using a microscope, intermediate complexity	1,331	913	$254.27	$77.50
88304 Pathology examination of tissue using a microscope, moderately low complexity	50	46	$153.60	$47.55
88342 Special stained specimen slides to examine tissue, initial procedure	48	41	$300.96	$113.88
88341 Special stained specimen slides to examine tissue	24	13	$277.08	$96.91
88321 Surgical pathology consultation and report on referred slides prepared elsewhere	13	13	$295.00	$105.96

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
88305 Pathology examination of tissue using a microscope, intermediate complexity	4,054	2,571	$255.42	$78.59
88341 Special stained specimen slides to examine tissue	141	41	$266.81	$97.21
88342 Special stained specimen slides to examine tissue, initial procedure	104	94	$287.40	$111.33
88304 Pathology examination of tissue using a microscope, moderately low complexity	98	87	$148.95	$45.55
88350 Antibody evaluation, each additional single antibody stain procedure	63	15	$199.48	$131.54
88321 Surgical pathology consultation and report on referred slides prepared elsewhere	51	50	$295.00	$105.56
88312 Special stained specimen slides to identify organisms including interpretation and report	51	40	$268.24	$125.71
88346 Antibody evaluation, initial single antibody stain procedure	16	15	$280.31	$170.88

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
88305 Pathology examination of tissue using a microscope, intermediate complexity	5,031	3,087	$256.21	$78.91
88342 Special stained specimen slides to examine tissue, initial procedure	126	114	$295.32	$119.00
88341 Special stained specimen slides to examine tissue	116	55	$277.63	$106.29
88304 Pathology examination of tissue using a microscope, moderately low complexity	115	103	$157.22	$48.50
88321 Surgical pathology consultation and report on referred slides prepared elsewhere	73	72	$295.00	$109.32
88312 Special stained specimen slides to identify organisms including interpretation and report	60	47	$285.00	$132.85
88350 Antibody evaluation, each additional single antibody stain procedure	44	11	$213.00	$129.64
88346 Antibody evaluation, initial single antibody stain procedure	11	11	$299.00	$171.23

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
88305 Pathology examination of tissue using a microscope, intermediate complexity	4,507	2,828	$254.72	$78.35
88341 Special stained specimen slides to examine tissue	194	52	$342.27	$98.33
88342 Special stained specimen slides to examine tissue, initial procedure	155	135	$266.08	$116.31
88304 Pathology examination of tissue using a microscope, moderately low complexity	130	117	$153.85	$46.50
88321 Surgical pathology consultation and report on referred slides prepared elsewhere	116	110	$295.00	$112.08
88350 Antibody evaluation, each additional single antibody stain procedure	61	14	$283.87	$101.21
88312 Special stained specimen slides to identify organisms including interpretation and report	48	45	$257.67	$124.21
88313 Special stained specimen slides to examine tissue including interpretation and report	16	14	$192.06	$89.31
88346 Antibody evaluation, initial single antibody stain procedure	15	14	$233.60	$138.44

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
88305 Pathology examination of tissue using a microscope, intermediate complexity	5,684	3,644	$251.99	$75.18
88342 Special stained specimen slides to examine tissue, initial procedure	491	433	$197.39	$92.01
88341 Special stained specimen slides to examine tissue	324	114	$335.48	$91.42
88350 Antibody evaluation, each additional single antibody stain procedure	215	43	$310.33	$88.05
88321 Surgical pathology consultation and report on referred slides prepared elsewhere	159	156	$295.00	$109.66
88304 Pathology examination of tissue using a microscope, moderately low complexity	148	129	$151.85	$44.14
88312 Special stained specimen slides to identify organisms including interpretation and report	93	63	$209.81	$100.43
88346 Antibody evaluation, initial single antibody stain procedure	43	43	$237.00	$126.08
88313 Special stained specimen slides to examine tissue including interpretation and report	21	15	$171.57	$80.57

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
88305 Pathology examination of tissue using a microscope, intermediate complexity	5,911	3,622	$242.93	$72.34
88342 Special stained specimen slides to examine tissue, initial procedure	423	375	$164.00	$91.83
88350 Antibody evaluation, each additional single antibody stain procedure	277	59	$266.91	$70.39
88341 Special stained specimen slides to examine tissue	218	79	$328.76	$90.01
88321 Surgical pathology consultation and report on referred slides prepared elsewhere	174	170	$295.00	$109.05
88304 Pathology examination of tissue using a microscope, moderately low complexity	161	148	$155.72	$44.65
88312 Special stained specimen slides to identify organisms including interpretation and report	120	89	$213.28	$99.71
88346 Antibody evaluation, initial single antibody stain procedure	60	58	$205.68	$94.07
17003 Destruction of precancer skin growth, 2-14 growths	57	14	$49.00	$5.84
99213 Established patient office or other outpatient visit, typically 15 minutes	53	51	$289.30	$78.52
88305 Pathology examination of tissue using a microscope, intermediate complexity	26	22	$148.00	$41.13
17000 Destruction of skin growth	23	23	$321.00	$55.49
99212 Established patient office or other outpatient visit with straightforward medical decision making, if using time, 10 minutes or more	20	20	$174.25	$47.95
11100 Biopsy of single growth of skin and/or tissue	17	16	$423.18	$110.51
88313 Special stained specimen slides to examine tissue including interpretation and report	14	14	$165.64	$75.11
99202 New patient office or other outpatient visit, typically 20 minutes	11	11	$297.64	$81.23
17110 Destruction of up to 14 skin growths	11	11	$458.00	$124.95

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
88305 Pathology examination of tissue using a microscope, intermediate complexity	6,898	4,095	$242.28	$73.65
88305 Pathology examination of tissue using a microscope, intermediate complexity	574	429	$147.23	$41.75
88342 Special stained specimen slides to examine tissue, initial procedure	440	384	$169.16	$93.06
88341 Special stained specimen slides to examine tissue	274	100	$262.61	$88.92
88350 Antibody evaluation, each additional single antibody stain procedure	220	41	$267.75	$78.12
88304 Pathology examination of tissue using a microscope, moderately low complexity	189	167	$153.81	$44.75
88321 Surgical pathology consultation and report on referred slides prepared elsewhere	169	161	$295.00	$110.98
88312 Special stained specimen slides to identify organisms including interpretation and report	105	70	$206.44	$101.22
99213 Established patient office or other outpatient visit, typically 15 minutes	87	78	$282.38	$79.56
88346 Antibody evaluation, initial single antibody stain procedure	58	43	$211.02	$102.03
99212 Established patient office or other outpatient visit with straightforward medical decision making, if using time, 10 minutes or more	44	37	$171.95	$47.96
17003 Destruction of precancer skin growth, 2-14 growths	37	12	$49.00	$6.31
17000 Destruction of skin growth	33	29	$321.00	$66.33
88304 Pathology examination of tissue using a microscope, moderately low complexity	28	23	$54.00	$12.81
11100 Biopsy of single growth of skin and/or tissue	22	20	$415.50	$116.07
99202 New patient office or other outpatient visit, typically 20 minutes	19	19	$291.58	$81.67
88344 Special stained specimen slides to examine tissue	11	11	$271.73	$184.12

Medical Specialties & State Licenses

Dermatology Primary Specialty

NUCC Taxonomy Code: 207N00000X

State License AR E-1269

A dermatologist is trained to diagnose and treat pediatric and adult patients with benign and malignant disorders of the skin, mouth, external genitalia, hair and nails, as well as a number of sexually transmitted diseases. The dermatologist has had additional training and experience in the diagnosis and treatment of skin cancers, melanomas, moles and other tumors of the skin, the management of contact dermatitis and other allergic and nonallergic skin disorders, and in the recognition of the skin manifestations of systemic (including internal malignancy) and infectious diseases. Dermatologists have special training in dermatopathology and in the surgical techniques used in dermatology. They also have expertise in the management of cosmetic disorders of the skin such as hair loss and scars and the skin changes associated with aging.

Dermatology - Dermatopathology

NUCC Taxonomy Code: 207ND0900X

State License AR E-1269

A dermatopathologist has the expertise to diagnose and monitor diseases of the skin including infectious, immunologic, degenerative and neoplastic diseases. This entails the examination and interpretation of specially prepared tissue sections, cellular scrapings and smears of skin lesions by means of routine and special (electron and fluorescent) microscopes.

Additional State Medicaid & Healthcare Payer Identifiers

Medicaid State Provider ID

131654001 (AR)

Hospital & Practice Group Affiliations

Massachusetts General Physicians Organization Inc

55 Fruit St, Boston, MA 021142696

Phone: 6177240287

Massachusetts General Physicians Organization Inc

50 Staniford St, Boston, MA 021142517

Practice Associates & Co-Workers

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

40 Associated Practitioners

Dr. Stuti Shroff , MD, MBBS

Pathology - Anatomic Pathology

NPI 1003050691

Doctor of Medicine (M.D.), Bachelor of Medicine, Bachelor of Surgery (M.B.B.S.)

Dr. Nancy Wang , MD

Internal Medicine - Hematology & Oncology

NPI 1003101056

Doctor of Medicine (M.D.)

Dr. Dusan Hanidziar , MD, PhD

Anesthesiology

NPI 1003103813

Doctor of Medicine (M.D.), Doctor of Philosophy (Ph.D.)

Dr. John Danko , DO

Physical Medicine & Rehabilitation

NPI 1003109596

Doctor of Osteopathic Medicine (D.O.)

Dr. Michael Lobritz , MD, PhD

Internal Medicine - Infectious Disease

NPI 1003122540

Doctor of Medicine (M.D.), Doctor of Philosophy (Ph.D.)

Kelly Trecartin , NP

Nurse Practitioner - Acute Care

NPI 1003130469

Nurse Practitioner

Career & Practice History Timeline

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

9 Historical Events

📍

Updated Practice Location September 16, 2019

Registered at 55 FRUIT ST, BOSTON, MA 021142621 (Tel: 1766589300)

📍

Updated Business Mailing Address September 16, 2019

Registered at 55 FRUIT ST, BOSTON, MA 021142696 (Tel: 1765869300)

🎓

Medical Taxonomy / Specialty Registered (Primary Specialty) September 16, 2019

Dermatology (License #E-1269 in AR)

✅

NPI Profile Active January 05, 2015

NPI status registered as active in NPPES database

📍

Updated Practice Location January 05, 2015

Registered at 4301 W MARKHAM ST # 576, LITTLE ROCK, AR 722057101 (Tel: 5016865110)

📍

Updated Business Mailing Address January 05, 2015

Registered at 4301 W MARKHAM ST # 576, LITTLE ROCK, AR 722057101 (Tel: 5016865110)

👤

Provider Name / Credentials Updated January 05, 2015

Recorded as THOMAS HORN, MD

🎓

Medical Taxonomy / Specialty Registered (Primary Specialty) January 05, 2015

Dermatology (License #E-1269 in AR)

🟢

Initial NPI Registration & Enumeration October 09, 2006

First registered as active Individual Practitioner in NPPES Database.

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NPI Administrative Meta

NPI Number: 1275620320

Entity Type:

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

Enumeration Date: October 09, 2006

Last Update: September 16, 2019

Sole Proprietor: No

Update or Correct Profile

Mailing Address

55 Fruit St

Boston, MA 021142696

Phone: 1765869300

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.