DR. GREGG PHILIP HARTMAN M.D.
NPI 1336105238
Orthopaedic Surgery - Sports Medicine in Simi Valley, CA

Q: What is Gregg Hartman's NPI number?

The NPI number for Gregg Hartman is 1336105238. It was assigned to this individual provider in the NPPES registry on April 21, 2006.

Q: What is Gregg Hartman's specialty?

The primary specialty registered for this NPI is Orthopaedic Surgery, specializing in Sports Medicine, with taxonomy code 207XX0005X.

Q: When was this NPI record last updated?

The NPPES record for Gregg Hartman was last updated on July 14, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 15 months ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.

Active since April 21, 2006PECOS EnrolledAccepts Medicare Assignment

75/100

CMS Quality Rating

2525 ERRINGER RD, SIMI VALLEY, CA 93065(805) 527-1404(805) 527-5246 Get Directions Write a Review

NPPES record last updated: July 14, 2025. Verified against the NPPES registry weekly; last sync: November 08, 2026.

Record update history: Mar 7, 2023, Oct 1, 2022, Nov 27, 2021 and 7 more (10 updates tracked since 2016).

On this page

About Dr. Gregg Philip Hartman M.d. NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

DR. GREGG PHILIP HARTMAN M.D. (NPI 1336105238) is an individual sports medicine provider in Simi Valley, California, licensed in California (A61757) and active in the NPI registry since April 2006. He is enrolled in Medicare PECOS, maintains a secondary practice location in Thousand Oaks, and is a graduate of Tulane University School Of Medicine (1992).

NPPES Registry Identity

NPI1336105238

Entity TypeIndividualMale

Primary Taxonomy207XX0005X

Provider Legal NameDR. GREGG PHILIP HARTMANCredential: M.D.

Location Address2525 ERRINGER RDSimi Valley, CA 93065-2352

Mailing Address1203 Flynn Rd Unit 160Camarillo, CA 93012-6203 · (805) 804-4168 · Fax (805) 830-1177

Phone(805) 527-1404

Fax(805) 527-5246

Sole ProprietorNo

Medical School CMSTulane University School Of MedicineGraduated 1992

Enumeration DateApril 21, 2006

Last NPPES UpdateJuly 14, 202510 updates tracked since enumeration

NPPES CertifiedJuly 14, 2025

✔ NPI 1336105238 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyOrthopaedic Surgery · Sports MedicineAllopathic & Osteopathic Physicians

Taxonomy Code207XX0005X

License✔ Licensed in CA · A61757

Definition

An orthopaedic surgeon trained in sports medicine provides appropriate care for all structures of the musculoskeletal system directly affected by participation in sporting activity. This specialist is proficient in areas including conditioning, training and fitness, athletic performance and the impact of dietary supplements, pharmaceuticals, and nutrition on performance and health, coordination of care within the team setting utilizing other health care professionals, field evaluation and management, soft tissue biomechanics and injury healing and repair. Knowledge and understanding of the principles and techniques of rehabilitation, athletic equipment and orthotic devices enables the specialist to prevent and manage athletic injuries.

Also ListedOrthopaedic SurgeryTaxonomy 207X00000X · License A61757 (CA)

2525 ERRINGER RD, Simi Valley, CA 93065

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Secondary Practice Location 1

Location 1137 E Thousand Oaks BlvdThousand Oaks, CA 91360-5707 · Phone (805) 379-4574 · Fax (805) 379-4324

Other Identifiers 1

OtherA61757CA · State License

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

Dr. Gregg Philip Hartman M.d. is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.

PECOS PAC ID5698739639

PECOS Enrollment IDI20050127000320

Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Medicare Billing Reassignment

Medicare enrollment records show Gregg Hartman reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

Ventura Orthopedics Medical Group, Inc.

Same address

Specialist

2525 ERRINGER RD
Simi Valley, CA 93065

Reassigned Medicare billing, California enrollment
73 clinicians in this Medicare group

NPI 1629531454 (805) 527-1404

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

Areas of Expertise CMS Part B claims 21

Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.

Hyaluronan or derivative, durolane, for intra-articular injection, 1 mg J7318

Hyaluronan or derivative, Durolane, is a treatment injected directly into the joint to relieve pain and improve mobility. It's often used for arthritis in the knee. The substance works by supplementing your body's natural joint fluid to help lubricate and cushion the joint.

5,580 services73 patients

Injection, triamcinolone acetonide, preservative-free, extended-release, microsphere formulation, 1 mg J3304

Triamcinolone acetonide is a long-lasting, preservative-free steroid injection. It's delivered in tiny, slow-releasing particles (microspheres) to manage inflammation or related conditions. The dose given is 1 mg. It's generally safe with few side effects.

2,080 services39 patients

Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more 99213

This is a routine visit for patients who have already been seen by the healthcare provider. During this approximately 20-29 minute appointment, your health status will be evaluated and any necessary treatments or tests will be discussed. It's a chance to address any health concerns you may have.

454 services319 patients

Injection, betamethasone acetate 3 mg and betamethasone sodium phosphate 3 mg J0702

This injection contains two medications, betamethasone acetate and betamethasone sodium phosphate. It is used to reduce inflammation and pain. It's given by a healthcare professional, often directly into the area causing discomfort.

444 services104 patients

Injection, gadolinium-based magnetic resonance contrast agent, not otherwise specified (nos), per ml A9579

This is an MRI procedure where a gadolinium-based contrast agent is injected into your body. The agent enhances the images, making it easier to detect abnormalities. It's safe and side effects are rare. It's administered per milliliter as needed.

349 services47 patients

Aspiration and/or injection of fluid from large joint 20610

This procedure involves using a needle to remove (aspiration) or introduce (injection) fluid into a large joint like the knee or hip. It can help diagnose conditions, relieve discomfort, or deliver medication directly to the joint.

290 services206 patients

Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more 99214

This is a routine check-up for patients who have previously visited our clinic. It involves a comprehensive review of your health and any ongoing treatments. The consultation lasts between 30-39 minutes, allowing enough time to discuss any concerns.

260 services215 patients

X-ray of knee, 4 or more views 73564

An X-ray of the knee, 4 or more views, is a non-invasive imaging test. It involves capturing multiple images of your knee from different angles. This helps in diagnosing conditions such as fractures, arthritis, or infections. The procedure is quick and painless.

181 services135 patients

Mri scan of lower spinal canal without contrast 72148

An MRI scan of the lower spinal canal without contrast is a non-invasive imaging test. It uses a magnetic field and radio waves to produce detailed images of your lower spine. This helps identify issues like disc problems, tumors, or nerve conditions. No dye is used.

111 services111 patients

X-ray of shoulder, minimum of 2 views 73030

An X-ray of the shoulder, with a minimum of 2 views, is a non-invasive imaging test. It uses a small amount of radiation to produce images of your shoulder bones. This helps in diagnosing conditions like fractures, arthritis, or other abnormalities. The procedure is quick and painless.

89 services81 patients

New patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more 99203

This service involves an initial office or outpatient visit for a new patient. The healthcare professional will spend 30-44 minutes understanding your health history, current issues, and discussing possible treatment plans. It's a comprehensive evaluation to start your healthcare journey.

87 services87 patients

Mri scan of arm joint without contrast 73221

An MRI scan of the arm joint is a non-invasive imaging procedure that uses magnetic fields and radio waves to create detailed images of the structures within your arm joint. No contrast dye is used in this process. It helps to diagnose or monitor conditions like arthritis, injuries, or infections.

69 services64 patients

Mri scan of leg joint without contrast 73721

An MRI scan of your leg joint is a non-invasive procedure that uses magnetic fields and radio waves to create detailed images of the structures within your leg. This helps doctors diagnose or monitor conditions without using contrast dye.

68 services66 patients

Fluoroscopic guidance for needle placement 77002

Fluoroscopic guidance for needle placement is a medical procedure that uses a special X-ray technology to help accurately place a needle in the body. It's often used in biopsies, injections or other treatments to ensure precision and safety.

52 services47 patients

Mri scan of upper spinal canal without contrast 72141

An MRI scan of the upper spinal canal without contrast is a non-invasive imaging test. It uses a magnetic field and radio waves to create detailed images of your upper spine. This helps doctors identify issues such as injuries, infections or diseases. No dye is used.

50 services50 patients

X-ray of hip, 2-3 views 73502

An X-ray of the hip with 2-3 views is a non-invasive imaging test. It uses a small amount of radiation to produce pictures of the hip joint. These images help in diagnosing conditions like fractures, arthritis, or other abnormalities. The process is quick and painless.

31 services30 patients

X-ray of lower and sacral spine, minimum of 4 views 72110

An X-ray of the lower and sacral spine involves capturing images of your lower back and tailbone area. It helps in identifying issues like fractures, arthritis, or other abnormalities. At least four different angles or 'views' are taken to get a comprehensive picture.

22 services22 patients

X-ray of wrist, minimum of 3 views 73110

An X-ray of the wrist, minimum of 3 views, is a diagnostic procedure that uses radiation to create images of your wrist from different angles. This helps detect fractures, infections, or other abnormalities for accurate diagnosis and treatment planning.

16 services11 patients

Removal of both knee cartilages using an endoscope 29880

This procedure, also known as bilateral knee arthroscopy, involves using a small camera (endoscope) to view and remove damaged cartilage from both knees. It's a minimally invasive surgery aimed at relieving pain and improving mobility.

15 services15 patients

X-ray of elbow, minimum of 3 views 73080

An elbow X-ray with a minimum of 3 views is a non-invasive imaging test. It helps visualize the bones of the elbow from different angles. This aids in diagnosing conditions like fractures or arthritis. The procedure is quick, painless, and usually takes around 15 minutes.

15 services15 patients

X-ray of upper spine, 4-5 views 72050

An X-ray of the upper spine with 4-5 views is a non-invasive imaging test. It uses radiation to capture detailed images of the bones and structures in your neck and upper back. This procedure helps identify issues like fractures, infections, or deformities.

14 services14 patients

Medicare Quality Performance CMS QPP · MIPS

Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.

75/100

MIPS Final ScoreMerit-based Incentive Payment System · CMS Quality Payment Program

Scored as part of a group practice

Other Providers at the Same Location NPPES 14

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

MOLLY BRECKLEY PT

Physical Therapist

2525 ERRINGER RD
SIMI VALLEY, CA 93065

Ventura County (805) 526-2311

PAYAM KASHFIAN, M.D., INC.

Radiology (Diagnostic Radiology)

2525 ERRINGER RD, SUITE A
SIMI VALLEY, CA 93065

Ventura County (805) 520-2663

DORIS A MESCH OTR/L

Occupational Therapist (Hand)

2525 ERRINGER RD
SIMI VALLEY, CA 93065

Ventura County (805) 524-1404

LAKSHMANAN SIVASUNDARAM

Orthopaedic Surgery (Sports Medicine)

2525 ERRINGER RD
SIMI VALLEY, CA 93065

Ventura County (805) 527-1404

DR. JOANNE HELEN WANG MD

Orthopaedic Surgery (Hand Surgery)

2525 ERRINGER RD
SIMI VALLEY, CA 93065

Ventura County (805) 527-1404

ZADE NEIL BATARSEH PA-C

Physician Assistant

2525 ERRINGER RD
SIMI VALLEY, CA 93065

Ventura County (805) 527-1404

MITCHELL WAYNE MOSDELL DPT

Physical Therapist

2525 ERRINGER RD
SIMI VALLEY, CA 93065

Ventura County (805) 303-2867

OLUMUYIWA IDOWU

Orthopaedic Surgery (Orthopaedic Surgery of the Spine)

2525 ERRINGER RD
SIMI VALLEY, CA 93065

Ventura County (805) 527-1404

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Gregg Hartman's NPI number?

The NPI number for Gregg Hartman is 1336105238. It was assigned to this individual provider in the NPPES registry on April 21, 2006.

Where is Gregg Hartman located?

Gregg Hartman practices at 2525 Erringer Rd, Simi Valley, CA 93065. The listed phone number is (805) 527-1404.

What is Gregg Hartman's specialty?

The primary specialty registered for this NPI is Orthopaedic Surgery, specializing in Sports Medicine, with taxonomy code 207XX0005X.

Is Gregg Hartman enrolled in Medicare?

Yes. Gregg Hartman is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.

Which organization bills Medicare for Gregg Hartman's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Gregg Hartman reassigns Medicare benefits to Ventura Orthopedics Medical Group, Inc. (Simi Valley, CA). The reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Gregg Hartman's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

When was this NPI record last updated?

The NPPES record for Gregg Hartman was last updated on July 14, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 15 months ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.