Dr. John Harker, DO - Orthopaedic Surgery in Largo, FL

Professional Overview & Biography Verified Profile Summary

Dr. John Harker, DO is a certified Orthopaedic Surgery practicing in Largo, FL. With approximately 37 years of clinical experience since graduating from Nova Southeastern College Of Osteo Medicine in 1989, Dr. Harker delivers high-quality medical care to the local community at 12955 SEMINOLE BLVD.

Dr. Harker is affiliated with Paul J Wisniewski Do Inc and accepts Medicare assignment.

Frequently performed procedures and clinical services include established patient outpatient office visit, aspiration and/or injection of fluid from large joint, injection, dexamethasone sodium phosphate, 1 mg. Full Medicare procedure pricing transparency rates and service volume details are listed on this profile.

Practice Location & Contact Primary Location

Practice Address

12955 Seminole Blvd

Largo, FL 337782399

Telephone 7275864752

Associated Practice Facility / Clinic

🏢 Southern Pinellas Surgical Pa Facility NPI 1811001233

Medicare Profile & Education

Medical School

Nova Southeastern College Of Osteo Medicine

Graduation Year

1989

Medicare Assignment

✓ Accepts Assignment

Telehealth Flag

In-Person Only

Specialty Benchmarks & Practice Insights

Comparative analytics for Orthopaedic Surgery in Largo, FL

Senior Veteran Specialist (>20 Yrs)

Practitioner Clinical Experience

37 Yrs +11.9 yrs vs City Avg

City Avg: 25.1 Yrs

State Avg: 27.1 Yrs

Regional Practice Density

13 Specialists

Practicing in Largo, FL (1597 Statewide)

Telehealth Adoption Rate

0.0% Regional Adoption

In-Person Office Visits Only

Medicare Pricing Discount

61.3% Avg Savings

Under CMS Medicare Fee Schedule vs Standard Submitted Charges

Clinical Seniority & Experience Comparison

Dr. Harker (37 Years) 37 Yrs

Largo Specialty Average (25.1 Years) 25.1 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
99213 Established patient office or other outpatient visit, typically 15 minutes	176	94	$210.00	$88.19
20610 Aspiration and/or injection of fluid from large joint	78	35	$270.00	$55.35
J1100 Injection, dexamethasone sodium phosphate, 1 mg	68	43	$70.00	$0.11
99214 Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more	38	33	$250.00	$124.51
99222 Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes	31	31	$300.00	$128.13
99203 New patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more	30	30	$254.00	$108.94
99204 New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more	23	23	$340.00	$163.41
99223 Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes	16	16	$500.00	$169.62
99212 Established patient office or other outpatient visit with straightforward medical decision making, if using time, 10 minutes or more	12	11	$116.00	$54.68

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
99213 Established patient office or other outpatient visit, typically 15 minutes	135	77	$210.00	$88.32
99214 Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more	109	79	$250.00	$125.40
20610 Aspiration and/or injection of fluid from large joint	106	49	$270.00	$57.85
J1100 Injection, dexamethasone sodium phosphate, 1 mg	72	49	$70.00	$0.13
99204 New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more	50	50	$340.00	$164.51
99223 Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes	37	37	$500.00	$173.03
99222 Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes	28	28	$300.00	$129.72
99203 New patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more	13	13	$254.00	$110.56

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	293	138	$250.00	$126.85
20610 Aspiration and/or injection of fluid from large joint	103	53	$270.00	$59.55
J1100 Injection, dexamethasone sodium phosphate, 1 mg	79	49	$70.00	$0.12
99223 Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes	72	72	$500.00	$197.34
99204 New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more	62	62	$340.00	$167.51
27245 Treatment of broken neck of thigh bone with bone implant	13	13	$5166.00	$1257.66

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	313	150	$250.00	$129.70
20610 Aspiration and/or injection of fluid from large joint	98	54	$270.00	$61.52
99223 Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes	90	88	$500.00	$201.13
99204 New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more	68	68	$340.00	$169.08
J1100 Injection, dexamethasone sodium phosphate, 1 mg	60	45	$70.00	$0.14
Q4206 Fluid flow or fluid gf, 1 cc	36	15	$2000.00	$2000.00

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	288	150	$250.00	$104.86
99223 Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes	138	132	$500.00	$199.01
20610 Aspiration and/or injection of fluid from large joint	89	53	$279.10	$57.75
99204 New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more	80	80	$340.00	$159.53
J1100 Injection, dexamethasone sodium phosphate, 1 mg	71	51	$70.00	$0.12
27236 Treatment of upper end of broken thigh bone with placement of stabilizing device or prosthetic replacement	14	14	$3500.00	$1210.19
27245 Treatment of broken neck of thigh bone with bone implant	12	12	$5166.00	$1247.92

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	348	186	$250.00	$107.49
99223 Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes	131	128	$500.00	$203.24
20610 Aspiration and/or injection of fluid from large joint	101	60	$275.35	$57.85
99204 New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more	85	85	$340.00	$162.32
J1100 Injection, dexamethasone sodium phosphate, 1 mg	66	52	$70.00	$0.12
20610 Aspiration and/or injection of fluid from large joint	17	16	$270.00	$46.24
27236 Treatment of upper end of broken thigh bone with placement of stabilizing device or prosthetic replacement	16	16	$3500.00	$1244.61
27245 Treatment of broken neck of thigh bone with bone implant	13	13	$5166.00	$1231.80

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	459	231	$250.00	$100.53
99223 Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes	132	130	$500.00	$191.98
99204 New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more	117	117	$340.00	$155.23
20610 Aspiration and/or injection of fluid from large joint	100	72	$272.70	$55.08
J1100 Injection, dexamethasone sodium phosphate, 1 mg	86	68	$70.00	$0.12
20610 Aspiration and/or injection of fluid from large joint	18	17	$270.00	$43.94
27245 Treatment of broken neck of thigh bone with bone implant	17	17	$5166.00	$1207.32
20550 Injection into tendon or ligament	16	14	$240.00	$48.87

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	442	217	$250.00	$99.31
99223 Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes	176	169	$500.00	$190.87
J1100 Injection, dexamethasone sodium phosphate, 1 mg	115	70	$70.00	$0.12
99204 New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more	111	111	$340.00	$153.26
20610 Aspiration and/or injection of fluid from large joint	109	64	$270.00	$52.28
20610 Aspiration and/or injection of fluid from large joint	31	30	$270.00	$44.71
99231 Follow-up hospital inpatient care per day, typically 15 minutes	16	14	$65.00	$36.91
20550 Injection into tendon or ligament	15	11	$240.00	$47.94
27245 Treatment of broken neck of thigh bone with bone implant	14	14	$5166.00	$1192.69
20605 Aspiration and/or injection of medium joint or joint capsule	13	13	$242.00	$47.40

Medical Specialties & State Licenses

CMS Verified: 2025-09-12

Orthopaedic Surgery Primary Specialty

NUCC Taxonomy Code: 207X00000X

State License FL OS-0006819

An orthopaedic surgeon is trained in the preservation, investigation and restoration of the form and function of the extremities, spine and associated structures by medical, surgical and physical means. An orthopaedic surgeon is involved with the care of patients whose musculoskeletal problems include congenital deformities, trauma, infections, tumors, metabolic disturbances of the musculoskeletal system, deformities, injuries and degenerative diseases of the spine, hands, feet, knee, hip, shoulder and elbow in children and adults. An orthopaedic surgeon is also concerned with primary and secondary muscular problems and the effects of central or peripheral nervous system lesions of the musculoskeletal system.

Orthopaedic Surgery

NUCC Taxonomy Code: 207X00000X

State License CA 20A23999

An orthopaedic surgeon is trained in the preservation, investigation and restoration of the form and function of the extremities, spine and associated structures by medical, surgical and physical means. An orthopaedic surgeon is involved with the care of patients whose musculoskeletal problems include congenital deformities, trauma, infections, tumors, metabolic disturbances of the musculoskeletal system, deformities, injuries and degenerative diseases of the spine, hands, feet, knee, hip, shoulder and elbow in children and adults. An orthopaedic surgeon is also concerned with primary and secondary muscular problems and the effects of central or peripheral nervous system lesions of the musculoskeletal system.

Hospital & Practice Group Affiliations

Paul J Wisniewski Do Inc

18523 Corwin Rd, Apple Valley, CA 923072300

Phone: 4073356950

Secondary Practice Locations

18523 Corwin Rd Ste A

Apple Valley, CA 923072300

Phone: 9097122764

Practice Associates & Co-Workers

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

2 Associated Practitioners

Dr. Richard Fansler , MD

Surgery

NPI 1528172939

Doctor of Medicine (M.D.)

Dr. Mariel Silva Musalem , MD

Pediatrics

NPI 1548453954

Doctor of Medicine (M.D.)

Career & Practice History Timeline

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

7 Historical Events

🎓

Medical Taxonomy / Specialty Registered (Primary Specialty) August 26, 2025

Orthopaedic Surgery (License #20A23999 in CA)

✅

NPI Profile Active July 08, 2007

NPI status registered as active in NPPES database

📍

Updated Practice Location July 08, 2007

Registered at 12955 SEMINOLE BLVD, LARGO, FL 337782399 (Tel: 7275864752)

📍

Updated Business Mailing Address July 08, 2007

Registered at 12955 SEMINOLE BLVD, LARGO, FL 337782399 (Tel: 7275864752)

👤

Provider Name / Credentials Updated July 08, 2007

Recorded as JOHN HARKER, DO

🎓

Medical Taxonomy / Specialty Registered (Primary Specialty) July 08, 2007

Orthopaedic Surgery (License #OS-0006819 in FL)

🟢

Initial NPI Registration & Enumeration August 30, 2006

First registered as active Individual Practitioner in NPPES Database.

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Dr. John Nicholas Harker , DO