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DR. STEPHEN ALEXANDER MACK APRN-CNP; PMHNP-C
NPI 1245352756
Nurse Practitioner - Family in Katy, TX

Active since April 04, 2007PECOS EnrolledAccepts Medicare Assignment
21613 PROVINCIAL BLVD, KATY, TX 77450(713) 777-9900(713) 777-9902 Get Directions Write a Review

NPPES record last updated: August 31, 2023. Verified against the NPPES registry weekly; last sync: October 18, 2026.

Record update history: Aug 31, 2023, Feb 28, 2023, Dec 7, 2015 (3 updates tracked since 2015).

About Dr. Stephen Alexander Mack Aprn-cnp; Pmhnp-c NPPES

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

DR. STEPHEN ALEXANDER MACK APRN-CNP; PMHNP-C (NPI 1245352756) is an individual family provider in Katy, Texas, licensed in Texas (AP128914) and active in the NPI registry since April 2007. He is enrolled in Medicare PECOS and is a graduate of Other (2015).

NPPES Registry Identity

NPI1245352756
Entity TypeIndividualMale
Primary Taxonomy363LF0000X
Provider Legal NameDR. STEPHEN ALEXANDER MACKCredential: APRN-CNP; PMHNP-C
Location Address21613 PROVINCIAL BLVDKaty, TX 77450-6506
Mailing Address6107 Mustang Trail LnFulshear, TX 77441-1121 · (281) 773-7267
Phone(713) 777-9900
Fax(713) 777-9902
Sole ProprietorYes
Medical School CMSOtherGraduated 2015
Enumeration DateApril 4, 2007
Last NPPES UpdateAugust 31, 20233 updates tracked since enumeration
NPPES CertifiedAugust 31, 2023
✔ NPI 1245352756 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 5

★ Primary SpecialtyNurse Practitioner · FamilyPhysician Assistants & Advanced Practice Nursing Providers
Taxonomy Code363LF0000X
License✔ Licensed in TX · AP128914
Also ListedChiropractorTaxonomy 111N00000X · License 9319 (TX)
Also ListedChiropractor · RehabilitationTaxonomy 111NR0400X · License 9319 (TX)
Also ListedChiropractor · Sports PhysicianTaxonomy 111NS0005X · License 9319 (TX)
Also ListedNurse PractitionerTaxonomy 363L00000X · License AP128914 (TX)
21613 PROVINCIAL BLVD, Katy, TX 77450
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Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Ambetter from Arizona Complete Health, Ambetter from Arkansas Health & Wellness, Ambetter from Louisiana Healthcare Connections and more.Insurance ›

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. Stephen Alexander Mack Aprn-cnp; Pmhnp-c 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 ID1557661550
PECOS Enrollment IDI20151124000072
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 Reassignments

4

Medicare enrollment records show Stephen Mack reassigns Medicare billing to 4 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Nluc PLLC
4.9 mi
Urgent Care
9722 GASTON RD STE 190
Katy, TX 77494
  • Reassigned Medicare billing, Texas enrollment
  • 379 clinicians in this Medicare group
NPI 1972152965 (281) 783-8162
Next Level Mv LLC
28 mi
Urgent Care
8325 BROADWAY ST STE 220
Pearland, TX 77581
  • Reassigned Medicare billing, Texas enrollment
  • 301 clinicians in this Medicare group
NPI 1013432285 (281) 201-0657
Travis W. Hird, M.D. PA
33 mi
Sports Medicine
117 VISION PARK BLVD
Shenandoah, TX 77384
  • Reassigned Medicare billing, Texas enrollment
  • 4 clinicians in this Medicare group
NPI 1376723833 (936) 443-8460
Doctors Express Of The Beaumont Area PA
97 mi
Urgent Care
3195 DOWLEN RD STE 105
Beaumont, TX 77706
  • Reassigned Medicare billing, Texas enrollment
  • 351 clinicians in this Medicare group
NPI 1841525235 (409) 860-1888

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 5

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.

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.
35 services34 patients
New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more 99204
This is a first-time office or outpatient visit lasting between 45-59 minutes. The healthcare provider evaluates your health, discusses your medical history, and may suggest further tests or treatments. It's an opportunity to ask questions and understand your health better.
21 services21 patients
Detection test by immunoassay with direct visual observation for severe acute respiratory syndrome coronavirus 2 (covid-19) 87811
This is a test to detect COVID-19, the virus causing severe respiratory illness. It uses a method called immunoassay, which identifies the virus by its unique proteins. The test is directly observed for accuracy. It helps determine if you're currently infected.
18 services18 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.
17 services17 patients
Injection of drug or substance under skin or into muscle 96372
This procedure involves administering medication directly under the skin or into a muscle. A small needle is used to inject the drug, allowing it to be absorbed quickly into the bloodstream. It's a common method for delivering a variety of medications.
12 services12 patients

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 77450 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
$90.40 typical visit price
range $58.24 – $176.98
Typical copayment $22.60 (range $14.56 – $44.24)
Most-billed visit code 99203
Established Patient
$102.71 typical visit price
range $18.60 – $143.93
Typical copayment $25.67 (range $4.65 – $35.98)
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 2

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

VIKRAM MEHRA M.D.
Psychiatry & Neurology (Psychiatry)
21613 PROVINCIAL BLVD
KATY, TX 77450
Harris County (713) 777-9900
VIKRAM MEHRA M.D.,P.A.
Psychiatry & Neurology (Psychiatry)
21613 PROVINCIAL BLVD
KATY, TX 77450
Harris County (713) 777-9900

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 Stephen Mack's NPI number?

The NPI number for Stephen Mack is 1245352756. It was assigned to this individual provider in the NPPES registry on April 4, 2007.

Where is Stephen Mack located?

Stephen Mack practices at 21613 Provincial Blvd, Katy, TX 77450. The listed phone number is (713) 777-9900.

What is Stephen Mack's specialty?

The primary specialty registered for this NPI is Nurse Practitioner, specializing in Family, with taxonomy code 363LF0000X.

Is Stephen Mack enrolled in Medicare?

Yes. Stephen Mack 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 organizations bill Medicare for Stephen Mack's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Stephen Mack reassigns Medicare benefits to 4 organizations: Nluc PLLC (Katy, TX), Next Level Mv LLC (Pearland, TX), Travis W. Hird, M.D. PA (Shenandoah, TX) and Doctors Express Of The Beaumont Area PA (Beaumont, TX). Each 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 Stephen Mack's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

What insurance does Stephen Mack accept?

Health plans from Ambetter Health, Ambetter from Arizona Complete Health, Ambetter from Arkansas Health & Wellness, Ambetter from Louisiana Healthcare Connections and Ambetter from Superior HealthPlan and 6 other insurers list Stephen Mack 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 Stephen Mack was last updated on August 31, 2023. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 3 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.