MARK PORTER M.D.
NPI 1871970301
Pediatrics - Pediatric Endocrinology in San Antonio, TX

Q: What is Mark Porter's NPI number?

The NPI number for Mark Porter is 1871970301. It was assigned to this individual provider in the NPPES registry on May 5, 2015.

Q: What is Mark Porter's specialty?

The primary specialty registered for this NPI is Pediatrics, specializing in Pediatric Endocrinology, with taxonomy code 2080P0205X.

Q: When was this NPI record last updated?

The NPPES record for Mark Porter was last updated on November 14, 2023. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 2 years 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 May 05, 2015PECOS Enrolled

315 N SAN SABA STE 1135, SAN ANTONIO, TX 78207(210) 704-3030 Get Directions Write a Review

NPPES record last updated: November 14, 2023. Verified against the NPPES registry weekly; last sync: November 01, 2026.

Record update history: Nov 14, 2023, May 21, 2021, Mar 19, 2019 (3 updates tracked since 2019).

On this page

About Mark Porter M.d. NPPES

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

MARK PORTER M.D. (NPI 1871970301) is an individual pediatric endocrinology provider in San Antonio, Texas, licensed in Texas (T1812) and active in the NPI registry since May 2015. He is enrolled in Medicare PECOS and maintains 2 additional practice locations.

NPPES Registry Identity

NPI1871970301

Entity TypeIndividualMale

Primary Taxonomy2080P0205X

Provider Legal NameMARK PORTERCredential: M.D.

Location Address315 N SAN SABA STE 1135San Antonio, TX 78207-3255

Mailing Address315 N San Saba Ste 1135San Antonio, TX 78207-3255

Phone(210) 704-3030

Sole ProprietorNo

Enumeration DateMay 5, 2015

Last NPPES UpdateNovember 14, 20233 updates tracked since enumeration

NPPES CertifiedNovember 14, 2023

✔ NPI 1871970301 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyPediatrics · Pediatric EndocrinologyAllopathic & Osteopathic Physicians

Taxonomy Code2080P0205X

Licenses✔ Licensed in TX · T1812✔ Licensed in MD · D86004

Definition

A pediatrician who provides expert care to infants, children and adolescents who have diseases that result from an abnormality in the endocrine glands (glands which secrete hormones). These diseases include diabetes mellitus, growth failure, unusual size for age, early or late pubertal development, birth defects, the genital region and disorders of the thyroid, the adrenal and pituitary glands.

Also ListedPediatricsTaxonomy 208000000X · License T1812 (TX)

315 N SAN SABA STE 1135, San Antonio, TX 78207

Open in Google Maps ↗

Secondary Practice Locations 2

Location 1333 N Santa RosaSan Antonio, TX 78207-3108 · Phone (210) 704-4708

Location 2200 N Wolfe StBaltimore, MD 21287-0011 · Phone (410) 955-6463

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Blue Cross and Blue Shield of Texas, CHRISTUS Health Plan, Oscar Insurance Company.Insurance ›

Medicare Participation & PECOS CMS

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

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Mark Porter 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.

Medicare Billing Reassignment

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

Baylor College Of Medicine

0.1 mi

Pediatrics

333 N SANTA ROSA
San Antonio, TX 78207

Reassigned Medicare billing, Texas enrollment
453 clinicians in this Medicare group

NPI 1285079764 (210) 704-3030

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

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 78207 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

$126.40 typical visit price

range $54.84 – $166.88

Typical copayment $31.60 (range $13.71 – $41.72)

Most-billed visit code 99204

Established Patient

$97.05 typical visit price

range $17.52 – $136.11

Typical copayment $24.26 (range $4.38 – $34.02)

Most-billed visit code 99214

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 3

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

LETICIA A SHANLEY M.D.

Pediatrics

315 N SAN SABA STE 1135
SAN ANTONIO, TX 78207

Bexar County (210) 704-3030

ESTEFANIA MARIE BAZAN MD

Pediatrics

315 N SAN SABA STE 1135
SAN ANTONIO, TX 78207

Bexar County (210) 704-2011

ALEXANDER HENRI MD

Pediatrics (Pediatric Emergency Medicine)

315 N SAN SABA STE 1135
SAN ANTONIO, TX 78207

Bexar County (107) 044-5802

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 Mark Porter's NPI number?

The NPI number for Mark Porter is 1871970301. It was assigned to this individual provider in the NPPES registry on May 5, 2015.

Where is Mark Porter located?

Mark Porter practices at 315 N San Saba Ste 1135, San Antonio, TX 78207. The listed phone number is (210) 704-3030.

What is Mark Porter's specialty?

The primary specialty registered for this NPI is Pediatrics, specializing in Pediatric Endocrinology, with taxonomy code 2080P0205X.

Is Mark Porter enrolled in Medicare?

Yes. Mark Porter is registered in the Medicare PECOS enrollment system.

Which organization bills Medicare for Mark Porter's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Mark Porter reassigns Medicare benefits to Baylor College Of Medicine (San Antonio, TX). 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 Mark Porter's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

What insurance does Mark Porter accept?

Health plans from Blue Cross and Blue Shield of Texas, CHRISTUS Health Plan and Oscar Insurance Company list Mark Porter as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.

When was this NPI record last updated?

The NPPES record for Mark Porter was last updated on November 14, 2023. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 2 years 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.