MARK J SINGER, MD, LCSW
MARK J SINGER, MD, LCSW is an organization registered with the National Plan and Provider Enumeration System (NPPES) under NPI 1497871461, based in Richmond, VA. The organization lists 2 taxonomy classifications, with Mental Health Counselor recorded as primary.
Getting there
The practice address on file is 605 TWINRIDGE LN, Richmond, VA 23235. 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 |
|---|---|---|
| 0904000716 | VA | Mental Health Counselor primary |
| 0904000716 | VA | Exclusive Provider Organization |
This provider holds licence 0904000716 issued in VA. A licence number in NPPES reflects what was filed at registration — it does not confirm the licence is still active today.
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.
What Mental Health covers
Definition to come... NUCC Health Care Provider Taxonomy, code 101YM0800X
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 | |
|---|---|---|---|---|
| 101YM0800X | Mental Health Counselor Mental Health | 0904000716 | VA | primary |
| 302F00000X | Exclusive Provider Organization | 0904000716 | VA |
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-2 identifies an organization — a clinic, hospital, group practice, laboratory, or supplier. Individual clinicians working there hold their own NPI-1 numbers separately, so a bill may reference both.
| NPI | 1497871461 valid check digit |
|---|---|
| Entity type | Organization (NPI-2) |
| Enumeration date | Mar 22, 2007 |
| Last updated | Sep 11, 2025 |
| Status | Active |
| Practice address |
605 TWINRIDGE LN Richmond, VA 23235 (804) 330-0816 |
| Mailing address |
3200 SAINT MARTINS TRL APT 1111 Richmond, VA 23294 |
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 | 4 | 9 | 7 | 8 | 7 | 1 | 4 | 6 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 4 | 9 | 7 | 7 | 7 | 2 | 4 | 3 |
Sum = 69 · next multiple of 10 = 70 · check digit = 1 · actual last digit = 1
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.