DR. MARGARET RYAN MARKHAM M.D.
NPI 1770803967
Obstetrics & Gynecology in Houston, TX

Q: What is Margaret Markham's NPI number?

The NPI number for Margaret Markham is 1770803967. It was assigned to this individual provider in the NPPES registry on June 10, 2010.

Q: What is Margaret Markham's specialty?

The primary specialty registered for this NPI is Obstetrics & Gynecology with taxonomy code 207V00000X.

Q: When was this NPI record last updated?

The NPPES record for Margaret Markham was last updated on January 26, 2022. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 4 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 June 10, 2010PECOS EnrolledAccepts Medicare Assignment

7400 FANNIN ST, SUITE 1050, HOUSTON, TX 77054(713) 795-1000(713) 795-1011 Get Directions Write a Review

NPPES record last updated: January 26, 2022. Verified against the NPPES registry weekly; last sync: October 25, 2026.

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About Dr. Margaret Ryan Markham M.d. NPPES

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

DR. MARGARET RYAN MARKHAM M.D. (NPI 1770803967) is an individual obstetrics & gynecology provider in Houston, Texas, licensed in Texas (P9903) and active in the NPI registry since June 2010. She is enrolled in Medicare PECOS, is affiliated with Houston Methodist Hospital, and is a graduate of Other (2010).

NPPES Registry Identity

NPI1770803967

Entity TypeIndividualFemale

Primary Taxonomy207V00000X

Provider Legal NameDR. MARGARET RYAN MARKHAMCredential: M.D.

Location Address7400 FANNIN ST, SUITE 1050Houston, TX 77054-1920

Mailing Address7400 Fannin St, Suite 1050Houston, TX 77054-1920 · (713) 795-1000 · Fax (713) 795-1011

Phone(713) 795-1000

Fax(713) 795-1011

Sole ProprietorNo

Medical School CMSOtherGraduated 2010

Enumeration DateJune 10, 2010

Last NPPES UpdateJanuary 26, 2022

✔ NPI 1770803967 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyObstetrics & GynecologyAllopathic & Osteopathic Physicians

Taxonomy Code207V00000X

License✔ Licensed in TX · P9903

Definition

An obstetrician/gynecologist possesses special knowledge, skills and professional capability in the medical and surgical care of the female reproductive system and associated disorders. This physician serves as a consultant to other physicians and as a primary physician for women.

7400 FANNIN ST, Houston, TX 77054

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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. Margaret Ryan Markham 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 ID7810217882

PECOS Enrollment IDI20150515000631

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 Margaret Markham reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

Hwca, PLLC

0.1 mi

Obstetrics & Gynecology

7400 FANNIN ST, SUITE 1050
Houston, TX 77054

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

NPI 1528299310 (713) 795-1000

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 4

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.

Cervical or vaginal cancer screening; pelvic and clinical breast examination G0101

This procedure involves checking for health issues in the lower abdomen and chest area. It helps identify early signs of certain conditions, increasing the chance for successful treatment. It's a routine check-up that's important for maintaining good health.

81 services81 patients

Screening papanicolaou smear; obtaining, preparing and conveyance of cervical or vaginal smear to laboratory Q0091

A Papanicolaou smear, often called a Pap smear, is a test to check for changes in cells. A small sample is gently collected from the lower region and sent to a lab for examination. This helps in early detection of potential health issues.

42 services42 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.

25 services23 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.

21 services18 patients

Hospital Affiliations CMS Care Compare 5

Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.

Houston Methodist Hospital

Acute Care Hospitals · Houston, TX

5/5 CMS rating

OwnershipVoluntary non-profit - Private

CMS Certification Number450358

Location6565 FanninHouston, TX 77030 · Harris County

Emergency services Birthing friendly

Womans Hospital Of Texas,the

Acute Care Hospitals · Houston, TX

3/5 CMS rating

OwnershipProprietary

CMS Certification Number450674

Location7600 FanninHouston, TX 77054 · Harris County

Emergency services Birthing friendly

Houston Methodist Sugarland Hospital

Acute Care Hospitals · Sugar Land, TX

4/5 CMS rating

OwnershipVoluntary non-profit - Private

CMS Certification Number450820

Location16655 Southwest FreewaySugar Land, TX 77479 · Fort Bend County

Emergency services Birthing friendly

Houston Methodist West Hospital

Acute Care Hospitals · Houston, TX

5/5 CMS rating

OwnershipVoluntary non-profit - Private

CMS Certification Number670077

Location18500 Katy FreewayHouston, TX 77094 · Harris County

Emergency services Birthing friendly

Hca Houston Healthcare Pearland

Acute Care Hospitals · Pearland, TX

3/5 CMS rating

OwnershipProprietary

CMS Certification Number670106

Location11100 Shadow Creek ParkwayPearland, TX 77584 · Brazoria County

Emergency services

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 77054 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

$134.06 typical visit price

range $58.24 – $176.98

Typical copayment $33.51 (range $14.56 – $44.24)

Most-billed visit code 99204

Established Patient

$72.62 typical visit price

range $18.60 – $143.93

Typical copayment $18.15 (range $4.65 – $35.98)

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 20

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

BERNARD ROSENFELD MD. PA

Obstetrics & Gynecology

7400 FANNIN ST, STE 910
HOUSTON, TX 77054

Harris County (713) 790-0099

TEXAS INSTITUTE FOR REPRODUCTIVE MEDICINE & ENDOCRINOLOGY PA

Internal Medicine (Endocrinology, Diabetes & Metabolism)

7400 FANNIN ST, STE 850
HOUSTON, TX 77054

Harris County (713) 791-1874

DR. BERNARD L. ROSENFELD M.D., PH.D.

Obstetrics & Gynecology

7400 FANNIN ST, SUITE 970
HOUSTON, TX 77054

Harris County (713) 790-0099

CENTER FOR MEDICAL GENETICS, PLLC

Clinical Medical Laboratory

7400 FANNIN ST, SUITE 700
HOUSTON, TX 77054

Harris County (713) 790-1990

DR. ELLIOTT RUSSELL WEIDMAN MD

Internal Medicine (Endocrinology, Diabetes & Metabolism)

7400 FANNIN ST, SUITE 850
HOUSTON, TX 77054

Harris County (713) 791-1874

DR. ALAGAPPAN ALAGAPPAN M.D.

Pediatrics (Neonatal-Perinatal Medicine)

7400 FANNIN ST, SUITE 810
HOUSTON, TX 77054

Harris County (713) 512-8500

PRIMARY HEALTH NETWORK OF SOUTH TEXAS

Obstetrics & Gynecology

7400 FANNIN ST, SUITE 1160
HOUSTON, TX 77054

Harris County (713) 799-8994

LINDA EGAN

Physician Assistant

7400 FANNIN ST, SUITE 1050
HOUSTON, TX 77054

Harris County (713) 795-1000

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 Margaret Markham's NPI number?

The NPI number for Margaret Markham is 1770803967. It was assigned to this individual provider in the NPPES registry on June 10, 2010.

Where is Margaret Markham located?

Margaret Markham practices at 7400 Fannin St Suite 1050, Houston, TX 77054. The listed phone number is (713) 795-1000.

What is Margaret Markham's specialty?

The primary specialty registered for this NPI is Obstetrics & Gynecology with taxonomy code 207V00000X.

Is Margaret Markham enrolled in Medicare?

Yes. Margaret Markham 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 Margaret Markham's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Margaret Markham reassigns Medicare benefits to Hwca, PLLC (Houston, 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 Margaret Markham's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

What insurance does Margaret Markham 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 5 other insurers list Margaret Markham 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.

Is Margaret Markham affiliated with any hospitals?

According to CMS data, Margaret Markham is affiliated with Houston Methodist Hospital, Womans Hospital Of Texas,the, Houston Methodist Sugarland Hospital, Houston Methodist West Hospital and Hca Houston Healthcare Pearland.

When was this NPI record last updated?

The NPPES record for Margaret Markham was last updated on January 26, 2022. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 4 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.