Karissa Gayosso, AGACNP-BC
Karissa Gayosso, AGACNP-BC is a Gerontology Nurse Practitioner in Fort Collins, CO, registered under NPI 1841836699. This provider registers 3 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
The practice address on file is 1120 E ELIZABETH ST STE 2, Fort Collins, CO 80524. 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 |
|---|---|---|
| APN.0995052-NP | CO | Gerontology Nurse Practitioner primary |
| APN.0995052-NP | CO | Nurse Practitioner |
| 76976 | NM | Acute Care Nurse Practitioner |
| APN.0995052-NP | CO | Acute Care Nurse Practitioner |
| 76976 | NM | Gerontology Nurse Practitioner |
Licences are recorded in 2 states: CO, NM. Providers licensed in several states often practise near a state border or deliver telehealth across state lines.
- Status
- Approved
- Provider type
- Practitioner - Nurse Practitioner
- PAC ID
- 7113356973
- Enrollment ID
- I20200421000291
Medicare enrolment is recorded as approved under the provider type Practitioner - Nurse Practitioner. 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: Colorado and New Mexico. The practice address on file is in Fort Collins, CO, 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
- APN.0995052-NP
- Specialty
- Gerontology Nurse Practitioner
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 Gerontology covers
Definition to come... NUCC Health Care Provider Taxonomy, code 363LG0600X
All registered taxonomy codes
This provider registers 5 taxonomy codes. The primary code is what appears on most claims; the others record additional recognised specialties.
| Code | Specialty | Licence | State | |
|---|---|---|---|---|
| 363LG0600X | Gerontology Nurse Practitioner Gerontology | APN.0995052-NP | CO | primary |
| 363L00000X | Nurse Practitioner | APN.0995052-NP | CO | |
| 363LA2100X | Acute Care Nurse Practitioner Acute Care | 76976 | NM | |
| 363LA2100X | Acute Care Nurse Practitioner Acute Care | APN.0995052-NP | CO | |
| 363LG0600X | Gerontology Nurse Practitioner Gerontology | 76976 | NM |
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 | 1841836699 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | Nov 26, 2019 |
| Last updated | May 21, 2025 |
| Status | Active |
| Sole proprietor | Yes |
| Credential | AGACNP-BC |
| Practice address |
1120 E ELIZABETH ST STE 2 Fort Collins, CO 80524 (970) 493-9193 |
| Mailing address |
PO BOX 46 Orchard, CO 80649 |
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 | 8 | 4 | 1 | 8 | 3 | 6 | 6 | 9 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 8 | 8 | 1 | 7 | 3 | 3 | 6 | 9 |
Sum = 71 · next multiple of 10 = 80 · 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.