Quick answers
- Does Marsha K. Howerton Engles accept Medicare assignment?
- Yes. Medicare's clinician data says Marsha K. Howerton Engles accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of October 2, 2026. Ask the office to confirm before your visit.
- How many Medicare patients does Marsha K. Howerton Engles see?
- In 2024, CMS data shows 107 Original Medicare patients and 237 services for Marsha K. Howerton Engles. This counts Original Medicare only and measures volume, not quality.
- What is Marsha K. Howerton Engles's NPI number?
- 1790720456. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Medicare activity in 2024
Official CMS public-use data for Marsha K. Howerton Engles, data year 2024 (released May 21, 2026). It covers Original Medicare (fee-for-service) patients only, not Medicare Advantage or other insurance. It shows volume, not quality or outcomes. CMS hides any count of 10 or fewer patients.
| Original Medicare patients | 107 |
|---|---|
| Services billed to Medicare | 237 |
| Different services or procedures | 17 |
| Participating Medicare provider | Yes |
| Average age of these patients | 72 |
Most frequent services
- Colorectal cancer screening; fecal occult blood test, immunoassay, 1-3 simultaneous (G0328)77 services
- Cervical or vaginal cancer screening; pelvic and clinical breast examination (G0101)53 services
- Screening papanicolaou smear; obtaining, preparing and conveyance of cervical or vaginal smear to laboratory (Q0091)47 services
- Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)22 services
- Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)18 services
Chronic conditions among these patients
Share of this clinician’s Original Medicare patients with each condition, as published by CMS (it describes the patients, not the care given).
- High cholesterol69%
- High blood pressure64%
- Arthritis49%
- Osteoporosis25%
- Anxiety24%
- Cancer (breast, colorectal, lung, prostate, endometrial or leukemia/lymphoma)18%
Hospitals where Marsha K. Howerton Engles works
Medicare's Facility Affiliation Data lists Marsha K. Howerton Engles at these hospitals (updated October 2, 2026). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians. Star rating and emergency services: Hospital General Information (CMS), data updated October 26, 2026.
- Ascension St John Broken ArrowBroken Arrow, OK · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 370235
- Ascension St John Medical CenterTulsa, OK · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 370114
- Hillcrest Medical CenterTulsa, OK · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 370001
- Saint Francis Hospital, IncTulsa, OK · Acute Care Hospital · Medicare rating: 5 of 5 stars · Emergency services: listed by Medicare · CCN 370091
- St John OwassoOwasso, OK · Acute Care Hospital · Medicare rating: 5 of 5 stars · Emergency services: listed by Medicare · CCN 370227
Practice locations
Addresses where Marsha K. Howerton Engles is enrolled with Medicare (CMS data updated October 2, 2026).
- 12455 E 100th St N, Suite 220Owasso, OK 74055 (918) 274‑5555
- 1705 E 19th StTulsa, OK 74104
- 1919 S Wheeling Ave, Suite 300Tulsa, OK 74104 (918) 794‑0701
Group practices
Medicare enrollment lists Marsha K. Howerton Engles as a member of this group (CMS data updated October 2, 2026).
- St. John Physicians, Inc.259 clinicians in the group
Specialties
- Obstetrics/Gynecologyprimary
Other OB-GYNs in Owasso
Clinicians with the same Medicare primary specialty in Owasso, OK — not a recommendation.
Other clinicians in St. John Physicians, Inc.
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 1986 (40 years since medical school) |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1790720456 |
| Corrections | Report an error or suggest an update → |
Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.
Sources
- Facility Affiliation Data — Centers for Medicare & Medicaid Services (CMS), data updated October 2, 2026, retrieved October 29, 2026
- Hospital General Information — CMS, data updated October 26, 2026, retrieved November 13, 2026
- National Downloadable File (Doctors and Clinicians) — CMS, data updated October 2, 2026, retrieved October 29, 2026
- Medicare Physician & Other Practitioners - by Provider — CMS, data year 2024, released May 21, 2026; Medicare Physician & Other Practitioners - by Provider and Service
- NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
- Medicare Care Compare — official Medicare tool to look up clinicians