Robert Johnston, M.D.
Robert Johnston, M.D. is a Maternal & Fetal Medicine Physician in Austin, TX, registered under NPI 1003194853. This provider registers 2 separate taxonomy codes, which usually means they practise across more than one recognised specialty. NPPES records them as a sole proprietor, meaning the practice is not incorporated as a separate legal entity.
Getting there
Here is what surrounds this office in Austin, based on OpenStreetMap data collected Sep 10, 2026. Parking is available about 353 ft away at Physicians Parking. There is EV charging 0.45 mi from the office (PIE AE PUB ACC NRIDGE 1) — useful if you are driving in from out of town. The nearest transit stop is 0.49 mi away, served by 12195 Metric/Cedar Bend.
Getting here and what is nearby
Parking 193 ft ~1 min
Parking Lot E - Women's Services Patient and Visitor Parking 317 ft ~2 min
Parking Physicians Parking 353 ft ~2 min
Restaurant P. Terry's 0.28 mi ~6 min
12301 North MoPac Expressway, Austin 78758
Restaurant The Hideout Pub 0.33 mi ~7 min
12164 Tx-1 Loop, Austin 78758
Mo-Fr 16:00-24:00; Sa-Su 17:00-24:00
EV charging PIE AE PUB ACC NRIDGE 2 0.44 mi ~9 min
EV charging ACCAE NORTHRIDGE 2 0.45 mi ~9 min
EV charging PIE AE PUB ACC NRIDGE 1 0.45 mi ~9 min
Convenience J J Mart 0.45 mi ~9 min
Gas station Exxon 0.46 mi ~10 min
Restaurant Biryani Pot 0.46 mi ~10 min
Transit 12166 Metric/Cedar Bend 0.48 mi ~10 min
Transit 12195 Metric/Cedar Bend 0.49 mi ~10 min
Grocery H-E-B 0.49 mi ~10 min
Hotel Extended Stay America 0.50 mi ~11 min
2700 Gracy Farms Lane, Austin 78758
Distances are straight‑line estimates — walking routes may be longer. Hours and phone numbers can change; call ahead to confirm.
Credentials and Medicare
| Licence | State | Specialty |
|---|---|---|
| A125165 | CA | Obstetrics & Gynecology Physician |
| R6421 | TX | Obstetrics & Gynecology Physician |
| R6421 | TX | Maternal & Fetal Medicine Physician primary |
Licences are recorded in 2 states: CA, TX. Providers licensed in several states often practise near a state border or deliver telehealth across state lines.
- Status
- Approved
- Provider type
- Practitioner - Obstetrics/gynecology
- PAC ID
- 5890006696
Enrolled in Medicare 2 times, across 2 states:
| State | Enrollment ID | Provider type |
|---|---|---|
| California | I20150619002373 | Practitioner - Obstetrics/gynecology |
| Michigan | I20210528001429 | Practitioner - Obstetrics/gynecology |
Medicare enrolment is recorded as approved under the provider type Practitioner - Obstetrics/gynecology. There are 2 separate enrolment records across 2 states (CA, MI). Multiple enrolments usually mean the provider bills Medicare from more than one practice location, or has kept an earlier enrolment after moving. Each record carries its own enrolment ID, listed above. Being enrolled means the provider can bill Medicare; 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 Texas. The practice address on file is in Austin, TX, 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
- R6421
- Specialty
- Obstetrics & Gynecology 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 Maternal & Fetal Medicine covers
An obstetrician/gynecologist who cares for, or provides consultation on, patients with complications of pregnancy. This specialist has advanced knowledge of the obstetrical, medical and surgical complications of pregnancy and their effect on both the mother and the fetus. The specialist also possesses expertise in the most current diagnostic and treatment modalities used in the care of patients with complicated pregnancies. NUCC Health Care Provider Taxonomy, code 207VM0101X
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 | |
|---|---|---|---|---|
| 207V00000X | Obstetrics & Gynecology Physician | A125165 | CA | |
| 207V00000X | Obstetrics & Gynecology Physician | R6421 | TX | |
| 207VM0101X | Maternal & Fetal Medicine Physician Maternal & Fetal Medicine | R6421 | TX | primary |
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 | 1003194853 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | Jul 28, 2011 |
| Last updated | Dec 27, 2021 |
| Status | Active |
| Sole proprietor | Yes |
| Gender | Male |
| Credential | M.D. |
| Practice address |
12200 RENFERT WAY STE G-3 Austin, TX 78758 (512) 821-2540 Fax (512) 973-3533 |
| Other names |
Robert Johnston Doing Business As |
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 | 0 | 0 | 3 | 1 | 9 | 4 | 8 | 5 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 0 | 0 | 3 | 2 | 9 | 8 | 8 | 1 |
Sum = 57 · next multiple of 10 = 60 · check digit = 3 · actual last digit = 3
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.