Directory Architecture

HTML Sitemap& Directory Index

A comprehensive, human-readable index of all primary directories, HCPCS J-codes, CPT vaccine crosswalks, pharmacologic classes, manufacturer profiles, and medical billing guides across MedCode Info.

Core Directories & Search Hubs

The primary tools and real-time lookup engines for healthcare providers, billers, and researchers.

NDC Directory Lookup

Search 130,000+ FDA National Drug Codes, active ingredients, dosage forms, and 11-digit HIPAA billing conversions.

HCPCS J-Codes Directory

Clinician-administered injectables, chemotherapies, biologics, billable units, and CPT vaccine crosswalks.

Coding & Billing Guide

Step-by-step guides on 10-to-11-digit NDC conversion, HIPAA box 24 formatting, and FDA marketing categories.

Medical Coding Glossary

Over 157 authoritative definitions spanning NDC, HCPCS, CPT, modifiers, CARC/RARC, and MedDRA.

Pharmacologic Classes

FDA Established Pharmacologic Classes (EPC) including GLP-1 agonists, statins, SGLT2 inhibitors, and mAbs.

Drug Manufacturers

FDA-registered labeler directories for Pfizer, Eli Lilly, Novo Nordisk, Merck, Genentech, and generic firms.

Clinical Trial Pipeline

Active Phase 1, Phase 2, and Phase 3 clinical studies recruiting now, sourced live from ClinicalTrials.gov.

Recent FDA Approvals

Newly marketed NDCs and newly approved NDAs, ANDAs, and BLAs updated live from FDA daily feeds.

Frequently Asked Questions

Answers to 21 common questions regarding NDC lookups, HCPCS J-codes, CPT billing, and reimbursement.

HCPCS J-Codes & CPT Vaccine Crosswalks

Individual code lookups, category groupings, and brand/generic name crosswalks.

Coding Guides & Regulatory Articles

Detailed technical explanations of US healthcare coding rules, data standards, and conversion algorithms.

NDC fundamentals

What Is an NDC Code? National Drug Code Explained

What an NDC is, what each of its three segments means, why it is an inventory identifier rather than an approval, and how the 10-digit FDA form differs from the 11-digit billing form.

NDC anatomy

NDC Code Format: How to Read the Three Segments

How to read the labeler, product and package segments of an NDC, what changes each one, and how to tell 4-4-2 from 5-3-2 and 5-4-1.

11-digit HIPAA conversion

Convert a 10-Digit NDC to 11-Digit HIPAA Format

The three leading-zero padding rules that turn an FDA 10-digit NDC into the 11-digit 5-4-2 format required on HIPAA claims, with a converter and worked examples.

Product vs package

Product NDC vs Package NDC: Which One Goes on a Claim

The difference between a two-segment product NDC and a three-segment package NDC, why only one of them belongs on a claim, and how the mix-up shows up as a denial.

FDA categories

NDA, ANDA and BLA: FDA Marketing Categories Explained

What NDA, ANDA, BLA, 505(b)(2) and OTC monograph mean in FDA drug data, and how the category changes which billing code a drug needs.

Data sources

Where MedCode Info Drug Data Comes From

The exact sources behind every figure on this site — openFDA, FDA Structured Product Labeling, ClinicalTrials.gov and the CMS HCPCS file — and what each one can and cannot tell you.

Clinical trial standards

Medical Coding in Clinical Trials: MedDRA, WHODrug & Regulatory Data

Explore how clinical trial medical coding standardizes safety data across multi-center studies with MedDRA and WHODrug, and how investigational therapies transition to commercial NDCs and J-codes upon FDA approval.

Pharmacologic Classes & Major Manufacturers

Directory pages for therapeutic classes and FDA-registered pharmaceutical companies.

Popular Drug Classes

FDA-Registered Manufacturers

Medical Coding Glossary Categories

Browse 157 terms categorized by topic across healthcare reimbursement, FDA regulation, and clinical trials.

XML Sitemaps for Search Engines & AI Crawlers

Machine-readable XML sitemap index and categorized sub-sitemaps conforming to the Sitemaps.org protocol.