Hernan Sierra Fernandez, M.D.
Hernan Sierra Fernandez, M.D. is a Neonatal-Perinatal Medicine Physician in Chicago, IL, registered under NPI 1104074749. 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 840 S WOOD ST CSB 1262, M/C 856, Chicago, IL 60612. 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 |
|---|---|---|
| 036-120314 | IL | Neonatal-Perinatal Medicine Physician primary |
| A105435 | CA | Neonatal-Perinatal Medicine Physician |
Licences are recorded in 2 states: IL, CA. Providers licensed in several states often practise near a state border or deliver telehealth across state lines.
- Status
- Approved
- Provider type
- Practitioner - Pediatric Medicine
- PAC ID
- 2264688688
Medicare enrolment is recorded as approved under the provider type Practitioner - Pediatric Medicine. This means the provider is enrolled to bill Medicare, though it does not tell you whether they are currently accepting new Medicare patients. Call the office to confirm.
Licensed in 2 states
This provider holds licences in 2 states: California and Illinois. The practice address on file is in Chicago, IL, 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
- A105435
- Specialty
- Neonatal-Perinatal Medicine Physician
- Licence
- 036-120314
- Specialty
- Neonatal-Perinatal Medicine Physician
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 Neonatal-Perinatal Medicine covers
A pediatrician who is the principal care provider for sick newborn infants. Clinical expertise is used for direct patient care and for consulting with obstetrical colleagues to plan for the care of mothers who have high-risk pregnancies. NUCC Health Care Provider Taxonomy, code 2080N0001X
All registered taxonomy codes
This provider registers 2 taxonomy codes. The primary code is what appears on most claims; the others record additional recognised specialties.
| Code | Specialty | Licence | State | |
|---|---|---|---|---|
| 2080N0001X | Neonatal-Perinatal Medicine Physician Neonatal-Perinatal Medicine | 036-120314 | IL | primary |
| 2080N0001X | Neonatal-Perinatal Medicine Physician Neonatal-Perinatal Medicine | A105435 | CA |
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 | 1104074749 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | Sep 8, 2008 |
| Last updated | May 1, 2020 |
| Status | Active |
| Sole proprietor | Yes |
| Credential | M.D. |
| Practice address |
840 S WOOD ST CSB 1262, M/C 856 Chicago, IL 60612 (312) 355-3282 Fax (312) 355-5548 |
| Mailing address |
130 N GARLAND CT APT 1703 Chicago, IL 60602 |
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 | 0 | 4 | 0 | 7 | 4 | 7 | 4 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 1 | 0 | 4 | 0 | 7 | 8 | 7 | 8 |
Sum = 61 · next multiple of 10 = 70 · check digit = 9 · actual last digit = 9
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.