Data provenance · generated from the library, built November 11, 2026
Where every OmniRx figure comes from, and which sources we do not use
This page is produced from the same ledger that feeds our pages and licensed files, so its counts cannot drift from the data. Every recorded fact carries its source address, the date it was read, its licence class and how it was proven. Newest fact: November 10, 2026.
Sources in use
Federal source records stay public; what OmniRx adds is the compilation, the joins and the dates.
- openFDA292,705 facts
Released by the FDA under CC0 1.0 (open.fda.gov/terms). Third-party content inside drug labels is not reproduced.
- Another recorded source268,458 facts
Licence checked before any fact was recorded.
- Another recorded source154,364 facts
Licence checked before any fact was recorded.
- Another recorded source51,718 facts
Licence checked before any fact was recorded.
- Another recorded source21,203 facts
Licence checked before any fact was recorded.
- Another recorded source16,423 facts
Licence checked before any fact was recorded.
- Another recorded source5,913 facts
Licence checked before any fact was recorded.
- Another recorded source4,856 facts
Licence checked before any fact was recorded.
- CMS Medicaid Drug Rebate Program product file4,734 facts
Published by CMS on data.medicaid.gov with the usa.gov government-works statement. The site publishes no separate reuse terms that we could find, so this rests on that statement.
- Another recorded source4,675 facts
Licence checked before any fact was recorded.
- Another recorded source4,242 facts
Licence checked before any fact was recorded.
- Another recorded source3,570 facts
Licence checked before any fact was recorded.
- Another recorded source3,455 facts
Licence checked before any fact was recorded.
- Another recorded source3,087 facts
Licence checked before any fact was recorded.
- CMS NADAC (pharmacy acquisition cost)1,015 facts
Published by CMS on data.medicaid.gov under the usa.gov government-works or public-domain label for each dataset year.
- Another recorded source996 facts
Licence checked before any fact was recorded.
- Another recorded source865 facts
Licence checked before any fact was recorded.
- Assistance programs’ own public pages851 facts
Facts only (figures, dates, statuses). No program text is copied; each fact names the page it came from.
- CMS ACA Federal Upper Limits569 facts
Published by CMS on data.medicaid.gov with the usa.gov government-works statement. The site publishes no separate reuse terms that we could find, so this rests on that statement.
- CMS Medicare negotiated prices file556 facts
A CMS publication of statutory prices. The page and file state no licence or restriction (read November 6, 2026). Billing-code columns are not used.
- Another recorded source305 facts
Licence checked before any fact was recorded.
- Another recorded source94 facts
Licence checked before any fact was recorded.
- Another recorded source86 facts
Licence checked before any fact was recorded.
- Another recorded source55 facts
Licence checked before any fact was recorded.
- Another recorded source20 facts
Licence checked before any fact was recorded.
- Another recorded source16 facts
Licence checked before any fact was recorded.
- Another recorded source2 facts
Licence checked before any fact was recorded.
Sources we do not use, and why
A source can be public and still not be ours to redistribute. The library will not record a fact from any of these.
- RxAssist
Its terms bar derivative products, commercial use and redistribution.
- NeedyMeds
Its terms are written for personal use, so we do not take data from it.
- WHO ATC/DDD classification
Commercial use and modification are not permitted.
- DrugBank
Free for non-commercial use only; commercial use needs a paid licence.
- WHO Essential Medicines List
Licensed for non-commercial use only and share-alike.
- DrugCentral
Share-alike licence: anything derived from it would have to carry the same licence.
- ChEMBL
Share-alike licence: anything derived from it would have to carry the same licence.
- MedlinePlus drug text
The drug text is licensed from a third party and is not public domain.
- Australia PBS public API
No reuse licence is stated, so we treat it as rights reserved.
How each fact was proven
- Taken whole from an official file or API685,812 facts
Carried over from the publisher’s own file with its date.
- Computed from a file we hash155,963 facts
A derived figure: the input file’s SHA-256 and the script are recorded, so anyone with the file can recompute it.
- Matched against the source text2,577 facts
A quote from the source was matched mechanically.
- Recorded without a quote to check471 facts
Shown as such, never presented as verified.
- Read by a person10 facts
A person read the source document and recorded the quote.
A fact whose check fails is never admitted.
Corrections log
Every change to a published or recorded figure is logged here with its date. This log is append-only.
Corrected after publication or recording
- The Entresto and Xarelto pages described the 2027 rows for packages that CMS has deselected from the Medicare negotiation program as a scheduled price change (for example "a scheduled change takes it to $303 on January 1, 2027" on the Entresto page). Those rows are deselection records, not prices: the file marks them "deselected from negotiation program with end date of 12/31/2026". We found this in a visual check of the live pages.November 7, 2026
Now: Pages treat a deselection record as the end of the negotiated price: the package table shows "ends 2026-12-31" in place of a scheduled price, and a note states how many packages CMS lists as deselected and that the file does not say why. A row is shown as a scheduled price only if it is not a deselection and does not end before it starts.
Caught by our checks before anything wrong went live
- A draft read a CMS indicator column as marking innovator drugs. The file's own description shows it marks prescription versus over-the-counter, and a separate category column carries the innovator signal.November 6, 2026
Now: The library stores both columns as the raw codes CMS publishes and interprets neither.
- A comparison set a brand drug's negotiated price beside the pharmacy cost of an authorized-generic package listed under the same drug, giving a ratio of about 3,300 percent.November 6, 2026
Now: Pages compare only brand-class packages and mark generic packages "generic, not compared".
- Federal upper limits last published years earlier sat far above current pharmacy costs (one at 25 times), which would have read as a finding.November 6, 2026
Now: A comparison is made only when the federal limit belongs to the current period; older rows keep their period and are never compared.
- A working note guessed that the pharmacy-cost benchmark falls back to the federal limit. The benchmark's methodology document says nothing of the kind, and the data showed the reverse direction.November 6, 2026
Now: The note was withdrawn. The pattern matches the federal rule at 42 CFR 447.514(b)(2), where the limit rises to the survey cost, and we state it with that limit on what we have verified.
What the library holds
- ndc listing 256,255
- drug label event 162,286
- ndc medicaid state utilization 154,364
- drug marketing status 52,577
- drug formulary tricare 51,718
- ndc recall 30,968
- drug te code 26,825
- drug approval 26,770
- drug medicaid spending 21,203
- drug partd spending 16,423
- drug orphan designation 5,913
- ndc newly reported 4,856
- CMS rebate-program product records 4,734
- ndc rxnorm 4,675
- drug formulary va 4,242
- drug asp price 3,570
- drug partb spending 3,087
- FDA drug-shortage rows, by package 2,242
- drug label indication 1,909
- drug generic entry earliest 1,469
- drug patent 1,348
- Package identity from openFDA 1,289
- drug rems 996
- NADAC pharmacy cost per unit 883
- drug biologic status 865
- drug exclusivity 638
- Medicare negotiated prices 556
- Federal Upper Limits 440
- Assistance program status 420
- company warning letter 280
- program eligibility 178
- Dated reads of source pages 152
- drug nadac price 131
- Derived findings: federal upper limit set by survey price 128
- drug controlled schedule 94
- policy event 86
- drug trial access 55
- Shortage state by ingredient 38
- program offer 33
- drug safety communication 25
- state spap 19
- program covers drug 19
- Assistance program income ceilings 18
- Assistance programs’ eligibility wording 18
- Ceiling checks against program documents 17
- state insulin cap 16
- partd standard benefit 2
- finding brand vs authorized generic 1
- finding ful nadac equality 1
- state medicaid work requirement 1
Method. The library is an append-only ledger: nothing is overwritten, so every figure can be traced to the day it was read and compared with what came before. Raw source files are kept byte-exact with a SHA-256. Pages and downloadable editions are derived from the ledger, and each frozen monthly edition carries a hash root so a licensee can confirm a file is unaltered; the roots and file checksums are listed on the editions page. Not medical, legal or financial advice. Report an error through the contact page. Licence the data.