Quick answers
- Does Gretchen May A. Calachan accept Medicare assignment?
- Yes. Medicare's clinician data says Gretchen May A. Calachan 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 Gretchen May A. Calachan see?
- In 2024, CMS data shows 170 Original Medicare patients and 293 services for Gretchen May A. Calachan. This counts Original Medicare only and measures volume, not quality.
- What is Gretchen May A. Calachan's NPI number?
- 1104559426. 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 Gretchen May A. Calachan, 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 | 170 |
|---|---|
| Services billed to Medicare | 293 |
| Different services or procedures | 7 |
| Participating Medicare provider | Yes |
| Average age of these patients | 74 |
Most frequent services
- Comprehensive hearing and speech recognition test (92557)133 services
- Test to assess middle ear function (92567)69 services
- Analysis and reprogramming of inner ear implant (7 years or older) (92604)46 services
- Evaluation of hearing function related to surgically implanted hearing device, first hour (92626)30 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 cholesterol75%
- High blood pressure73%
- Arthritis54%
- Ischemic heart disease34%
- Diabetes26%
- Anxiety26%
Practice locations
Addresses where Gretchen May A. Calachan is enrolled with Medicare (CMS data updated October 2, 2026).
- 4530 E Shea Blvd, Suite 180Phoenix, AZ 85028 (602) 264‑4834
- 5750 W Thunderbird Rd, Suite A100Glendale, AZ 85306 (602) 938‑3205
Group practices
Medicare enrollment lists Gretchen May A. Calachan as a member of these groups (CMS data updated October 2, 2026).
- HonorHealth Ambulatory630 clinicians in the group
- Arizona Otolaryngology Consultants, PC22 clinicians in the group
Specialties
- Qualified Audiologistprimary
Other audiologists in Phoenix
Clinicians with the same Medicare primary specialty in Phoenix, AZ — not a recommendation.
Other clinicians in HonorHealth Ambulatory
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | AU |
|---|---|
| Graduation year | 2022 |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1104559426 |
| 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
- 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