October 2026Dataset Refreshed: Expanded to 15.17M+ Unique Contacts
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What is data cleansing?

Also called: data hygiene, data cleaning, Data Cleansing & Verification

Data cleansing is fixing or removing incorrect, duplicate, incomplete or badly formatted records in a database, for example merging duplicate physicians, standardizing titles and addresses, and removing invalid emails.

By John Britton, VP of Marketing, MedicalProspects · Updated November 4, 2026 · Provider Identity & Data

Why it matters for healthcare sales and marketing

Dirty data wastes rep time, breaks segmentation and hurts deliverability. In healthcare CRMs the usual problems are duplicate physicians from different sources, inconsistent titles, outdated addresses and emails that no longer work.

How it works

  1. De-duplicate on a stable key: NPI for clinicians, otherwise email or name plus organization.
  2. Standardize titles, specialties, addresses and phone formats.
  3. Validate emails and remove or flag failures.
  4. Remove records that can't be fixed or are no longer relevant.
  5. Enrich what's missing, which is a separate step (data enrichment).
Five steps of data cleansing: de-duplicate, standardize, validate, remove, then enrich.
Cleansing fixes what you have; enrichment adds what's missing.

Example

Illustrative scenario. Before a CRM migration, a Marketing Ops team finds the same cardiologist in three records with different spellings and two old emails. It merges records on NPI, standardizes specialty values to taxonomy-based categories, removes invalid emails, and imports a smaller, cleaner database.

Common mistakes

  • De-duplicating on name. Common names merge different people. Use NPI where you can.
  • Cleansing once a year. Build it into regular operations.
  • Deleting without a backup. Keep a record of what changed.

Related terms

  • Data EnrichmentData enrichment means filling in missing or outdated fields on records you already have, for example adding a provider's specialty, NPI, verified email or phone, by matching your records against a more complete, verified data source.
  • Data DecayData decay is the gradual loss of accuracy in a contact database as people change jobs, retire, move practices, or their organizations merge and change email domains.
  • Email VerificationEmail verification is checking that an email address is correctly formed, belongs to a domain that accepts mail, and points to a mailbox that exists, before you send to it. For healthcare lists it also means confirming the address still belongs to the right person in the right role.
  • National Provider Identifier (NPI)A National Provider Identifier (NPI) is a unique, permanent 10-digit number that identifies a U.S. healthcare provider or healthcare organization. CMS issues it through NPPES, and it identifies who the provider is, not their specialty or contact details.

Put it to work

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