Recently Updated NPI Information — some details in this NPI profile have been updated in the NPI registry within the last 60 days.

DR. HENRY MARKLEY GASS IV M.D.
NPI 1346637949
Orthopaedic Surgery in Tustin, CA

Active since April 21, 2015PECOS Enrolled
14642 NEWPORT AVE STE 105, TUSTIN, CA 92780(949) 688-0958(949) 688-0960 Get Directions Write a Review

NPPES record last updated: August 6, 2026. Verified against the NPPES registry weekly; last sync: August 16, 2026.

About Dr. Henry Markley Gass Iv M.d. NPPES

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

DR. HENRY MARKLEY GASS IV M.D. (NPI 1346637949) is an individual orthopaedic surgery provider in Tustin, California, licensed in California (A201942) and active in the NPI registry since April 2015. He is enrolled in Medicare PECOS.

NPPES Registry Identity

NPI1346637949
Entity TypeIndividualMale
Primary Taxonomy207X00000X
Provider Legal NameDR. HENRY MARKLEY GASS IVCredential: M.D.
Location Address14642 NEWPORT AVE STE 105Tustin, CA 92780-6058
Mailing Address14642 Newport Ave Ste 105Tustin, CA 92780-6058 · (949) 688-0958 · Fax (949) 688-0960
Fax(949) 688-0960
Sole ProprietorYes
Enumeration DateApril 21, 2015
Last NPPES UpdateAugust 6, 2026
NPPES CertifiedAugust 6, 2026
NPI 1346637949 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

Primary SpecialtyOrthopaedic SurgeryAllopathic & Osteopathic Physicians
Taxonomy Code207X00000X
License Licensed in CA · A201942
Definition
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.
14642 NEWPORT AVE STE 105, Tustin, CA 92780

Group Practice 1

Group TaxonomyThis provdier is a business group of one or more individual practitioners, all of who practice with the same area of specialization.193400000X SINGLE SPECIALTY GROUP

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, and ordering and referring status from the CMS PECOS system.

Medicare Enrollment Status

Enrolled in Medicare (PECOS)

Dr. Henry Markley Gass Iv M.d. is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

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.

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 92780 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient
$96.36 typical visit price
range $62.96 – $187.60
Typical copayment $24.09 (range $15.74 – $46.90)
Most-billed visit code 99203
Established Patient
$77.96 typical visit price
range $20.84 – $153.61
Typical copayment $19.49 (range $5.21 – $38.40)
Most-billed visit code 99213
Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

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.

Acupuncturist
14642 NEWPORT AVE STE 105
TUSTIN, CA 92780
Family Medicine (Geriatric Medicine)
14642 NEWPORT AVE STE 105
TUSTIN, CA 92780
Nurse Practitioner (Family)
14642 NEWPORT AVE STE 105
TUSTIN, CA 92780
Orthopaedic Surgery (Orthopaedic Surgery of the Spine)
14642 NEWPORT AVE STE 105
TUSTIN, CA 92780
Clinic/Center (Rehabilitation)
14642 NEWPORT AVE STE 105
TUSTIN, CA 92780
Family Medicine (Adult Medicine)
14642 NEWPORT AVE STE 105
TUSTIN, CA 92780
Orthopaedic Surgery (Sports Medicine)
14642 NEWPORT AVE STE 105
TUSTIN, CA 92780
Acupuncturist
14642 NEWPORT AVE STE 105
TUSTIN, CA 92780

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 Henry Gass's NPI number?

The NPI number for Henry Gass is 1346637949. It was assigned to this individual provider in the NPPES registry on April 21, 2015.

Where is Henry Gass located?

Henry Gass practices at 14642 Newport Ave Ste 105, Tustin, CA 92780. The listed phone number is (949) 688-0958.

What is Henry Gass's specialty?

The primary specialty registered for this NPI is Orthopaedic Surgery with taxonomy code 207X00000X.

Is Henry Gass enrolled in Medicare?

Yes. Henry Gass is registered in the Medicare PECOS enrollment system.

When was this NPI record last updated?

The NPPES record for Henry Gass was last updated on August 6, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 14 days 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.