Isabelle Guillou, APRN-FPA, CNM, IBCLC
Isabelle Guillou, APRN-FPA, CNM, IBCLC is a provider specialising in Advanced Practice Midwife in Mesa, AZ, registered under NPI 1114232386. NPPES records them as a sole proprietor, meaning the practice is not incorporated as a separate legal entity.
Getting there
The practice address on file is 4202 E BROADWAY RD UNIT 87, Mesa, AZ 85206. We have not yet mapped what surrounds this office — parking, transit, and nearby pharmacies are added as our data collection reaches each location.
Credentials and Medicare
| Licence | State | Specialty |
|---|---|---|
| 290623 | AZ | Advanced Practice Midwife primary |
| 277-300309 | IL | Advanced Practice Midwife |
| 377-000306 | IL | Advanced Practice Midwife |
Licences are recorded in 2 states: AZ, IL. Providers licensed in several states often practise near a state border or deliver telehealth across state lines.
This NPI does not appear in the PECOS Medicare enrolment file. Providers who do not bill Medicare — or who bill only through a group's enrolment — will not appear here. It is not a sign of any problem with the registration.
Licensed in 2 states
This provider holds licences in 2 states: Arizona and Illinois. The practice address on file is in Mesa, AZ, but a licence in another state usually means they see patients there too — either at a second location or by telehealth. If the address above is far from you, it is worth calling to ask whether they practise closer to where you live.
- Licence
- 290623
- Specialty
- Advanced Practice Midwife
Licence numbers are self-reported to NPPES at registration. They do not confirm a licence is currently active, in good standing, or valid for the specialty shown — only the state board can tell you that, which is why we link to each one.
What Advanced Practice Midwife covers
Advanced practice midwifery encompasses the independent provision of care during pregnancy, childbirth, and the postpartum period; sexual and reproductive health; gynecologic health; and family planning services, including preconception care. Midwives also provide primary care for individuals from adolescence throughout the lifespan as well as care for the healthy newborn during the first 28 days of life. Midwives provide initial and ongoing comprehensive assessment, diagnosis, and treatment. Midwifery care includes health promotion, disease prevention, risk assessment and management, and individualized wellness education and counseling. NUCC Health Care Provider Taxonomy, code 367A00000X
All registered taxonomy codes
This provider registers 3 taxonomy codes. The primary code is what appears on most claims; the others record additional recognised specialties.
| Code | Specialty | Licence | State | |
|---|---|---|---|---|
| 367A00000X | Advanced Practice Midwife | 290623 | AZ | primary |
| 367A00000X | Advanced Practice Midwife | 277-300309 | IL | |
| 367A00000X | Advanced Practice Midwife | 377-000306 | IL |
The taxonomy records how the provider classifies their own practice. It does not confirm which conditions they currently treat, whether they are accepting new patients, or which insurance they take — call the office for that.
Full NPPES record
An NPI-1 identifies a single person. It stays with the clinician for life, even if they move practice or change state, which is why the address on file can lag behind where they actually work today.
| NPI | 1114232386 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | Aug 12, 2010 |
| Last updated | Feb 2, 2026 |
| Status | Active |
| Sole proprietor | Yes |
| Credential | APRN-FPA, CNM, IBCLC |
| Practice address |
4202 E BROADWAY RD UNIT 87 Mesa, AZ 85206 (630) 209-3250 Fax (480) 558-4384 |
Number check
How the check works, step by step
Every NPI carries a Luhn check digit — the same scheme used on credit cards. CMS prefixes the number with 80840 before computing it, which marks it as a US health identifier.
| Digit | 8 | 0 | 8 | 4 | 0 | 1 | 1 | 1 | 4 | 2 | 3 | 2 | 3 | 8 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 1 | 2 | 4 | 4 | 3 | 4 | 3 | 7 |
Sum = 54 · next multiple of 10 = 60 · check digit = 6 · actual last digit = 6
A valid check digit only means the number is well-formed. It does not mean the provider is licensed, active, or in good standing — those are separate questions answered by the sections above.