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License Verification API — Nurses, MDs & OIG Exclusions

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Primary source verification for US professional licenses. Search 19 state boards by name or license number: status, expiration, disciplinary actions. Cross-checks the NPPES NPI registry and screens the HHS-OIG exclusion list. Bulk roster screening. Newly licensed clinicians feed (roster-delta).

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from $5.50 / 1,000 results

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Developer

Kyle Maloney

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4 days ago

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Categories

Business

Automation

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License number

license_number

Optional

State-issued professional license number.

Type:string | null

Example:

454090

License type / profession

license_type

Optional

Profession or license category.

Type:string | null

Example:

Registered Nurse

Title

title

Optional

Short title/abbreviation for the license (e.g. RN).

Type:string | null

Example:

Status (raw)

status

Optional

License status exactly as the board publishes it.

Type:string | null

Example:

CURRENT (C)

First name

first_name

Optional

Licensee first name.

Type:string | null

Example:

MARY

Last name

last_name

Optional

Licensee last name (or the full combined name on boards that publish one field).

Type:string | null

Example:

SMITH

Business name

business_name

Optional

Business or DBA name, if applicable.

Type:string | null

City

city

Optional

Licensee city.

Type:string | null

Example:

CHICAGO

State

state

Optional

Two-letter state code.

Type:string | null

Example:

ZIP

zip

Optional

Licensee ZIP code.

Type:string | null

County

county

Optional

Licensee county.

Type:string | null

Example:

TRAVIS

Original issue date

original_issue_date

Optional

Date the license was first issued (ISO).

Type:string | null

Example:

1980-08-14

Expiration date

expiration_date

Optional

License expiration date (ISO).

Type:string | null

Example:

2026-11-30

Specialty

specialty

Optional

Specialty or qualifier, if any.

Type:string | null

Example:

11 - INTENSIVE/CRITICAL CARE

Ever disciplined

ever_disciplined

Optional

True if the board flags a disciplinary history on this licensee.

Type:boolean | null

Example:

true

Discipline reason

discipline_reason

Optional

Reason for disciplinary action, if any.

Type:string | null

Discipline action

discipline_action

Optional

Type of disciplinary action taken.

Type:string | null

Board state

board_state

Optional

Two-letter state of the board that issued the license.

Type:string | null

Example:

Source agency

source_agency

Optional

Issuing agency.

Type:string | null

Example:

TX Board of Nursing

Source URL

source_url

Optional

Link to the official primary-source verification page.

Type:string | null

Roster: first name searched

roster_first_name

Optional

Batch roster mode — the first name searched for this verdict row.

Type:string | null

Example:

Mary

Roster: last name searched

roster_last_name

Optional

Batch roster mode — the last name searched for this verdict row.

Type:string | null

Example:

Smith

Roster: requested state

roster_state

Optional

Batch roster mode — the state requested, or null if every board was searched.

Type:string | null

Example:

Match found

match_found

Optional

True if at least one license record was found for this roster entry.

Type:boolean | null

Example:

true

Match count

match_count

Optional

Number of candidate license records found across the searched boards.

Type:number | null

Example:

125

Best-match confidence

best_match_confidence

Optional

'exact' (strong, untied identification), 'partial' (weak or tied), or 'none'.

Type:string | null

Example:

exact

Roster: license number (best match)

license_no

Optional

License number of the best-matching record for this roster entry.

Type:string | null

Example:

454090

Roster: license status (best match)

license_status

Optional

Raw license status of the best-matching record.

Type:string | null

Example:

CURRENT (C)

Is active

is_active

Optional

True when the license is in good standing. Derived from the board-specific status vocabulary, not a substring guess. Null when nothing could be verified.

Type:boolean | null

Example:

true

Roster: source agency (best match)

source

Optional

Issuing agency of the best-matching record.

Type:string | null

Example:

TX Board of Nursing

Checked at

checked_at

Optional

ISO timestamp of the verification.

Type:string | null

Example:

2026-07-26T12:00:00.000Z

Record type

record_type

Optional

'license' for a single-search license record, 'roster_verdict' for a batch verdict row.

Type:string | null

Example:

roster_verdict

Verdict

verdict

Optional

Credentialing verdict: LICENSED_ACTIVE, LICENSED_NOT_ACTIVE, AMBIGUOUS, NOT_FOUND, or INCONCLUSIVE_SOURCE_ERROR. INCONCLUSIVE_SOURCE_ERROR means a source could not be reached — it is NOT evidence the person is unlicensed.

Type:string | null

Example:

LICENSED_ACTIVE

Match score

match_score

Optional

Identity confidence 0-100: last name exact 30, first name exact 25, middle initial 10, NPI license join 25, profession agreement 10.

Type:number | null

Example:

Match tier

match_tier

Optional

verified_npi_join | exact_name_single_state | exact_name_multi_state | surname_only | none.

Type:string | null

Example:

verified_npi_join

Match reasons

match_reasons

Optional

Comma-separated list of which signals contributed to the score.

Type:string | null

Example:

last_name_exact,first_name_exact,npi_license_join

Candidates returned

candidates_returned

Optional

How many candidate records were scored for this verdict.

Type:number | null

Example:

125

Candidates tied

candidates_tied

Optional

How many candidates tied for the top score. Greater than 1 forces an AMBIGUOUS verdict.

Type:number | null

Example:

Candidates truncated

candidates_truncated

Optional

True when a board hit the per-board fetch cap, so more candidates may exist than were scored.

Type:boolean | null

Example:

true

Board ID

board_id

Optional

Identifier of the specific board the best-matching record came from.

Type:string | null

Example:

TX-BON

Board coverage

board_coverage

Optional

Plain-English description of exactly what that board covers.

Type:string | null

Example:

Registered Nurses (RN) — Texas Board of Nursing

Status class

status_class

Optional

Type:string | null

Example:

active

Boards searched

boards_searched

Optional

Every board that was queried for this row.

Type:string[] | null

Example:

TX-BON

Boards searched (count)

boards_searched_count

Optional

How many boards were queried.

Type:number | null

Example:

Boards FAILED

boards_failed

Optional

Boards that could not be reached. If this is non-empty, a NOT_FOUND result cannot be trusted — the verdict becomes INCONCLUSIVE_SOURCE_ERROR.

Type:string[] | null

Boards failed (count)

boards_failed_count

Optional

How many boards could not be reached.

Type:number | null

Example:

Boards failed (detail)

boards_failed_detail

Optional

Per-board failure reason, so a source outage is auditable.

Type:string | null

Unsupported filters

unsupported_filters

Optional

Filters you asked for that this board has no column for and therefore could not apply.

Type:string | null

Middle name

middle_name

Optional

Licensee middle name, where the board publishes it. Used to break same-name ties.

Type:string | null

Example:

L MURRAY

Nursing school

nursing_school

Optional

Basic nursing education institution (Texas Board of Nursing).

Type:string | null

Example:

UT HEALTH SCIENCE CENTER - HOUSTON - BS

State of original licensure

state_of_original_licensure

Optional

State that first licensed this nurse (Texas Board of Nursing).

Type:string | null

Example:

Primary practice setting

practice_setting

Optional

Self-reported practice setting (Texas Board of Nursing).

Type:string | null

Example:

1 - INPATIENT HOSPITAL CARE

Prescriptive authority number

prescriptive_authority_number

Optional

APRN prescriptive authority number (Texas Board of Nursing).

Type:string | null

Example:

36278

Prescriptive authority status

prescriptive_authority_status

Optional

APRN prescriptive authority status.

Type:string | null

Example:

Inactive

Prescriptive authority expiration

prescriptive_authority_expiration

Optional

APRN prescriptive authority expiration date (ISO).

Type:string | null

NPI

npi

Optional

National Provider Identifier from the federal NPPES registry.

Type:string | null

Example:

1184193849

NPI status

npi_status

Optional

NPPES enumeration status.

Type:string | null

Example:

Active

NPI credential

npi_credential

Optional

Credential string the provider reported to NPPES (e.g. RN, M.D., LCSW).

Type:string | null

Example:

Primary taxonomy

primary_taxonomy

Optional

Primary NUCC taxonomy description — what this provider actually practises as.

Type:string | null

Example:

Registered Nurse

Taxonomy code

taxonomy_code

Optional

Primary NUCC taxonomy code.

Type:string | null

Example:

163W00000X

NPI-reported license number

npi_license_number

Optional

The state license number the provider self-reported to NPPES. This is the join key that resolves same-name ambiguity.

Type:string | null

Example:

454090

NPI-reported license state

npi_license_state

Optional

State of the NPPES-reported license.

Type:string | null

Example:

Practice city

practice_city

Optional

Primary practice location city from NPPES.

Type:string | null

Example:

AUSTIN

Practice state

practice_state

Optional

Primary practice location state from NPPES.

Type:string | null

Example:

Practice address

practice_address

Optional

Primary practice street address from NPPES.

Type:string | null

OIG excluded

oig_excluded

Optional

TRUE only when matched to the HHS-OIG exclusion list by NPI, or by last+first+state. A surname-only hit never sets this.

Type:boolean | null

Example:

false

Exclusion match basis

exclusion_match_basis

Optional

How the exclusion was matched: 'npi' (authoritative), 'name_state' (probable), or 'surname_only_review' (a namesake exists — review required, NOT an exclusion).

Type:string | null

Exclusion type

exclusion_type

Optional

Social Security Act section under which the person was excluded (e.g. 1128b4).

Type:string | null

Exclusion date

exclusion_date

Optional

Date the exclusion took effect (ISO).

Type:string | null

Reinstatement date

reinstatement_date

Optional

Date the person was reinstated, if applicable (ISO).

Type:string | null

Exclusion specialty

exclusion_specialty

Optional

Provider type/specialty recorded on the exclusion record.

Type:string | null

Exclusion state

exclusion_state

Optional

State recorded on the exclusion record.

Type:string | null

Exclusion review required

exclusion_review_required

Optional

True when someone with the same surname appears on the exclusion list but identity could not be confirmed. Review manually; this is not an exclusion.

Type:boolean | null

Example:

false

Exclusion surname hits

exclusion_surname_hits

Optional

How many exclusion records share this surname. 688 people named SMITH are on the list, which is why surname alone is never sufficient.

Type:number | null

Example:

Exclusion candidates

exclusion_candidate_count

Optional

How many exclusion records share this exact name and state.

Type:number | null

Example:

Exclusion candidate name

exclusion_candidate_name

Optional

Full name on the candidate exclusion record, so a reviewer can compare it against the licensee.

Type:string | null

Example:

MARY CLAIRE SMITH

Exclusion candidate DOB

exclusion_candidate_dob

Optional

Date of birth on the candidate exclusion record — usually the fastest way to rule a namesake in or out.

Type:string | null

Example:

1951-05-18

Exclusion candidate city

exclusion_candidate_city

Optional

City on the candidate exclusion record.

Type:string | null

Example:

KINGSVILLE

OIG list as of

leie_as_of

Optional

Publication timestamp of the HHS-OIG exclusion file used for this run.

Type:string | null

Example:

Fri, 10 Jul 2026 12:35:14 GMT

Board action found

board_action_found

Optional

True if a disciplinary/board action was found. NULL means the disciplinary source could not be checked — it does NOT mean the record is clean.

Type:boolean | null

Example:

false

Board action count

board_action_count

Optional

Number of disciplinary actions found.

Type:number | null

Example:

Board action type

board_action_type

Optional

Most recent disciplinary action type.

Type:string | null

Board action date

board_action_date

Optional

Date of the most recent disciplinary action (ISO).

Type:string | null

Board action detail

board_action_detail

Optional

Narrative or profession/board context for the most recent action.

Type:string | null

Discipline source

discipline_source

Optional

Which disciplinary dataset the action came from.

Type:string | null

Discipline source error

discipline_source_error

Optional

Why a disciplinary lookup failed, when it did.

Type:string | null

Mode

mode

Optional

Run mode that produced the row: "roster-delta" for the newly-credentialed feed; null for classic lookup / roster rows.

Type:string | null

Example:

roster-delta

Feed

feed

Optional

Feed name for roster-delta rows ("roster-delta"); null otherwise.

Type:string | null

Example:

roster-delta

Event type

event_type

Optional

roster-delta: "inventory" on the seeding run (the whole window), "newly_licensed" on later runs (credential absent from the saved baseline AND issued on/after the previous run minus 7 days).

Type:string | null

Example:

newly_licensed

Event basis

event_basis

Optional

Plain-English reason the row was emitted, naming the issue date, the cutoff and the previous run.

Type:string | null

Example:

credential absent from the saved baseline and issued 2026-09-25, on/after the cutoff 2026-09-19 (previous run 2026-09-26 minus 7 days)

Profession (normalised)

profession

Optional

Credential type with its kind suffix removed ("Registered Nurse License" -> "Registered Nurse"); for TX BON / WA-CPA / NY-NOTARY legs the board's fixed profession. The raw value stays in license_type.

Type:string | null

Example:

Registered Nurse

Credential kind

credential_kind

Optional

Type:string | null

Example:

license

Profession filter

profession_filter

Optional

The professions input as applied, pipe-joined; null when no filter was given.

Type:string | null

Example:

Registered Nurse

Profession filter matched on

profession_filter_matched_on

Optional

Which professions entry this row satisfied; null when no filter.

Type:string | null

Example:

Registered Nurse

Employer

employer

Optional

Texas Board of Nursing place_of_employment when the licensee reported one (RN / LVN); null elsewhere.

Type:string | null

Example:

Memorial Hermann Hospital Houston TX

Window (days)

since_days

Optional

roster-delta: the sinceDays window applied.

Type:number | null

Example:

Window since

window_since_date

Optional

roster-delta: first original-issue date in the window (ISO).

Type:string | null

Example:

2026-08-27

Window until

window_until_date

Optional

roster-delta: last original-issue date in the window (ISO, the run date).

Type:string | null

Example:

2026-09-26

Delta scope key

delta_scope_key

Optional

Key of the named KV baseline this run read and wrote (scoped by boards + professions). A different states/professions selection uses a different baseline.

Type:string | null

Example:

ROSTER_DELTA_TX-BON,WA_P_1a2b3c4d

Baseline existed

delta_baseline_seeded

Optional

true when a saved baseline was found and diffed against; false on the seeding run (rows are inventory).

Type:boolean | null

Example:

true

Previous run date

delta_previous_run_at

Optional

Run date of the baseline this run was diffed against; null on the seeding run.

Type:string | null

Example:

2026-09-26

Delta cutoff

delta_cutoff_date

Optional

Earliest issue date a first-seen credential may carry and still be newly_licensed (previous run minus 7 days); null on the seeding run.

Type:string | null

Example:

2026-09-19

Late records suppressed

delta_late_records_suppressed

Optional

Credentials first seen this run but issued BEFORE the cutoff (re-issues, late publication) — added to the baseline, NOT emitted as new.

Type:number | null

Example:

Already seen

delta_already_seen

Optional

Windowed credentials already present in the baseline this run.

Type:number | null

Example:

1581

Legs requested

run_legs_requested

Optional

Board ids the run planned to read.

Type:string[] | null

Example:

WA,TX-BON

Legs OK

run_legs_ok

Optional

Board ids that passed the drift gate and were read; null if none.

Type:string[] | null

Example:

WA,TX-BON

Legs failed

run_legs_failed

Optional

Board ids that failed the gate or the fetch; null if none.

Type:string[] | null

Example:

TX-BON

Legs failed reason

run_legs_failed_reason

Optional

Per-board reason for every failed leg (drift vs availability is named).

Type:string | null

Example:

TX-BON: source unavailable during pre-flight (row_count_floor=unavailable (HTTP 503))

Legs skipped

run_legs_skipped

Optional

Requested boards that cannot run a delta (no original-issue-date column) or whose fixed profession does not match the filter, with the reason.

Type:string[] | null

Example:

TX: no original-issue-date column published

Run complete

run_complete

Optional

true when every requested leg answered and no page-loop guard was hit; false means the run is a disclosed partial.

Type:boolean | null

Example:

true

Matched rows total

matched_rows_total

Optional

Events produced by the delta before the maxResults cap.

Type:number | null

Example:

1581

Results truncated

results_truncated

Optional

true when matched_rows_total exceeded maxResults; the newest credentials are kept.

Type:boolean | null

Example:

false

Rows not emitted (cap)

rows_not_emitted_due_to_cap

Optional

matched_rows_total minus rows emitted.

Type:number | null

Example:

Max results cap

max_results_cap

Optional

The total row cap applied to this run.

Type:number | null

Example:

Drift gate status

drift_gate_status

Optional

This row's board: verified | verified_degraded (a corroborating probe could not pass; disclosed) — drifted/unavailable boards emit no rows.

Type:string | null

Example:

verified

Drift gate note

drift_gate_note

Optional

Every probe outcome with its measurement, e.g. row_count_floor=pass (total 2455566 vs floor 2400000).

Type:string | null

Example:

row_count_floor=pass (total 2455566 vs floor 2400000); window_filter_applied=pass (bogus-window count 0); ...

Leg server total

leg_server_total

Optional

The source's exact count for this run's window + profession filter (the truncation guard).

Type:number | null

Example:

1581

Leg rows in window

leg_rows_in_window

Optional

Rows whose issue date parsed and fell inside the window after client-side re-checking.

Type:number | null

Example:

1581

Leg rows undated

leg_rows_undated

Optional

Fetched rows whose issue date could not be parsed (never guessed, never emitted).

Type:number | null

Example:

Source data as of

source_data_as_of

Optional

Upstream publication stamp when the source states one; null when it does not.

Type:string | null

Example:

null

NPI match confidence

npi_match_confidence

Optional

Type:string | null

Example:

single_candidate

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